Portable Macintosh Computers
Apple Technical Notes collection has many useful articles on laptop hardware. The collection is most easily browsed with the Sherlock application that appeared in MacOS 10.2.
Clever Powerbook Decoration: The whole subject of cute cosmetic modifications to computers is insanely boring to most normal people (take my word for it). But this is so clever it transcends the genre.
pbparts.com: Powerbook parts and repair.
pbzone.com: "The PowerBook Zone--Your Mobile Technology News Source"
The Lombard (Powerbook G3 Series (bronze keyboard)) Service Manual Can be found here.Duo
Duo and 2400 Information Page.
More Duo info from Matt Minser.
PowerBook Duo 2300c popup warning
Service manuals for several portables and desktops.