* ThinkPad T2x系列（T20，T21，T22，T23）
o Pentium III Mobile, sub-5 lb (2.3 kg) class machines. Contained processors ranging from 0.18 micrometre PIIIM 700 MHz to 0.13 micrometre PIIIM 1+ GHz. Typically had 14.1 inch XGA screens, Ultrabay 2000 optical drives, S3 Savage/IX-MV graphics chip and Cirrus Logic CS 4614/22/24 sound chips; although variations along the line existed. Introduced the Thinklight, a LED mounted inside the upper screen lip and illuminating the keyboard (activated with Fn-PgUp, the extreme diagonal keys); and titanium-reinforced screen lids. Used miniPCI form factor cards, which could be modem and/or ethernet. With the T23, an internal wi-fi antenna became available, so wi-fi miniPCI cards could be used. Did not contain the active hard drive protection, or touchpad & trackpoint combination pointing devices which appeared in later models. T series ThinkPads were clad in black non-slip rubber with embedded glitter. The case lid had tabs along the edge that interlocked with depressions in the lower case when closed, to reduce case flexing. Comparatively more stylish, functional, and rugged machines; and easy to disassemble for repair or upgrades.
* ThinkPad T3x系列
o Solely includes the T30 model. Features include an Intel Mobile Pentium 4 processor ranging from 1.6 GHz to 2.4 GHz. Graphics were provided by a Radeon 7500 driver running on 16 MB of discrete video memory. The T30 was available with a 14.1 inch screen, with resolutions of 1024 x 768 and 1400 x 1050. Features available include the imbedded security subsystem, UltraNav touchpad, 256MB standard memory, a 20, 40 or 60GB hard disk, Ultrabay Plus drive, wireless, and Bluetooth. The shell is titanium reinforced composite. The whole package was a bit heavier and thicker than the T4x series.
* ThinkPad T4x系列
o 包括T40，T41，T42，T43以及其包含的“p”系列（高性能 "Performance" 例如T43p）。 一台典型的T4X机器重约2.2kg （4.9磅），略比600系列小巧，而其特点是应用了Intel Pentium M（英特尔 奔腾M）处理器（从Intel Pentium M 1.3 Ghz 到 Intel Pentium M 770 @ 2.13 Ghz），14.1或15英寸LCD（液晶显示器）（XGA，SXGA+标准），型使用了集成显卡Intel GMA 900（Intel Graphics Media Adapter 900）或独立的显卡（ATI Radeon 7500，9000，X300，Fire GL 9000，9600，Fire GL T2及Fire GLV 32000，其硬盘有从30GB到100GB不等的容量，并应用了Active Protection System（活动保护系统，官方称为安全气囊技术）以保护硬盘（T41及以后的型号）。 "p" (mobile workstation) models are also available with a 14" SXGA+ or a 15 inch UXGA FlexView display with wide viewing angle and high density IPS technology with resolutions up to 1600x1200. These 15 inch display models weigh slightly more than their lesser brethren, with optical drive and battery, at 2.7 kg (5.9 lb). Some T42 and T43 models feature a biometric security system with built-in fingerprint reader.
* ThinkPad T6x系列
o 到2006年为止包括T60系列，作为T4x系列的换代产品，这是T系列首次采用英特尔双核技术的酷睿处理器。
* ThinkPad X2x系列（X20，X21，X22，X23，X24）
o Pentium III Mobile, sub-4 lb machines. Contained processors ranging from PIIIM 500 MHz to PIIIM 1+ GHz. 12.1 inch XGA screens, and ATi Rage Mobility M1 (X20, X21) or Radeon Mobility M6 (X22, X23, X24) graphics chips. Used miniPCI form factor cards, which supports modem and/or ethernet. With the X22 and later machines, provisions for wireless networking support are built into the chassis. Ultrabay 2000 optical drive support can be fitted via the Ultrabase portable docking station option, and extended batteries can give the series a 5 hour running time.
* ThinkPad X3x series (X30, X31, X32)
o Pentium III Mobile (X30) or Pentium M (X31, X32), 12.1 inch XGA screens, FireWire, Compact Flash card slot. No built-in optical drive.
* ThinkPad X4x Series
o An example of the lightweight X series, weighing in at 1.2 kg (2.7 lb), 25% lighter than its predecessor, the X31. [1]
* ThinkPad X6x Series
o Includes, as of 2006, the X60; intended as the next generation of the X6x Series Thinkpads; this is the first X Series ThinkPad to feature Intel "Yonah" Dual Core Technology.
Lenovo UltraBay
UltraBay是Lenovo ThinkPad可替换装置插槽的名字。它先在ThinkPad 750系列被引入，其后每一代ThinkPad的UltraBay都几乎会被重新设计，希望这里可以弄清因此而带来的混淆。
下表是每一种UltraBay的概要，包括在何种型号出现过以及有那些装置可供配搭。这留意G系ThinkPad的光盘驱动器并不是UltraBay装置一员，它是紧固并不可以移除的。
不同的UltraBay型号之间最显著的分别在于其大小。例如，早期的A、T和X系可以容纳高达12.5毫米厚的UltraBay装置，而现在的T和X系只限于9.5毫米厚的。
Lenovo UltraBay 命名法
| UltraBay Type | Featured in | Available devices |
|---|---|---|
| UltraBay | All 760’s and 765’s | FD, CD, Extra PCMCIA, HD, Battery, ZIP-100 |
| UltraBay II | 770, 770E, 770ED, 770X, 770Z | FD, CD/DVD, CD-RW/DVD, HD, Battery, ZIP-100, ZIP-250, LS-120 |
| UltraBay FX | 390, 390E, 390X | FD, CD/DVD, CD-RW/DVD, Battery |
| UltraSlimBay | 570, 570E, 600, 600E, 600X | FD, CD/DVD, CD-RW/DVD, HD, Battery, ZIP-100, ZIP-250, LS-120 |
| UltraBay 2000 | A20, A21, A22, T20, T21, T22, X20, X21, X22, X23, X24 | FD, CD/DVD, CD-RW/DVD, Multiburner, HD, Battery, ZIP-100, ZIP-250, LS-120, LS-240 |
| UltraBay Plus | A30, A30p, A31, A31p, R30, R31, R32, R40, T23, T30, X30, X31 | FD, CD/DVD, CD-RW/DVD, Multiburner, HD, Battery, ZIP-100, ZIP-250, WorkPad Cradle, Numberpad, and all Ultrabay 2000 devices |
| UltraBay Slim | R50, R50p, R51, R51p, R52, R52p, T40, T40p, T41, T41p, T42, T42p, T43, T43p, X4 UltraBase | CD/DVD, CD-RW/DVD, Multiburner, HD, Battery |
| UltraBay Enhanced | R50, R50p, R51, R51p, R52, R52p, | CD/DVD, CD-RW/DVD, Multiburner |
其他
* ThinkPad的名字是源于一本约3吋乘4.5吋大的袋装笔记薄，其啡色的人造皮面上印有Think的字样，背面则印有IBM。这些笔记薄在IBM员工当中非常流行，员工随时都可以在任何IBM办公室中免费索取新的笔记薄。
* Thinkpad是开源码操作系统OpenBSD开发人员当中最受欢迎的便携式电脑，而ThinkPad T40更是最受系统支持的便携式电脑型号之一。
* 有不少原来的ThinkPad用家指，联想收购了ThinkPad之后，虽然价钱便宜了一大截，但可靠度大幅下跌，而外型也变差了，使他们转而选购其他公司的电脑。亦有人指其实品质变差的情况打从IBM把生产线移往中国大陆时就已经出现，情况跟IBM出品的硬盘一样。而相信要让品牌重拾往日的可靠度，还需要一段时间去让生产线调适。