Mini graphics tablet - works but PC compatible only (
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=6839412044&ssPageName=STRK:MESE:IT
USB Microscope camera - it works but it's PC only, used it at work a bit but for home use it's a pain not being able to use it with the laptop, I'm going to get one that has Mac support too.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=7581181798&ssPageName=STRK:MESE:IT
Composite/SVHS video module thingy for iBook G4 - thought this would be useful, it works but everything I wanted to use it with now has VGA or firewire input. PAL or NTSC output.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=8750849703&ssPageName=STRK:MESE:IT
Don't all rush at once...