The Sony PEG-UX50 was an impressive package when it was released in 2003. It had a 480x320 screen, keyboard, convertible screen, built-in camera, WiFi and Bluetooth. As with most portable devices, the short time the battery stayed charged left much to be desired. Sony sold an EB40 battery pack that piggy-backed the device, but reader [JAmerican] wanted to extend its charge even further. It took a little dancing around with the charging circuit, but he was eventually able to combine 4 batteries to construct a 3880mAh battery that keeps the UX50 running, even after 9 hours of use. Here's a site with a decent photo gallery of the UX50 (at the bottom).

Myriam a.k.a. [tnkgrl] decided that the the Averatec 1050 laptop was sorely in need of some Bluetooth and was tired of losing a port to a USB dongle. The AV1050 reports 3 usb ports in the device manager, but only features two external ports. She disassembled the laptop and went looking for the third port. The end result is 2 fully functioning USB ports and internal Bluetooth. There's enough detail in the post you should be able to pull this off with other laptops as well.

what do you get when you mix a hitachi trk-8200hr boombox and the fujitsu stylistic 1200 tablet pc? more retro you can shake your checkered vans at. i really like the idea of gutting out an old school boom box and using a tablet pc to mimic the original interface, rad.