Webbit is like timbit - it comes in 12, 20 or 40 pack, contains many small pieces of different taste and color, is generally unhealthy but good, can be addictive and is nice addition to your morning "extra large, double cream" from Tim Hortons. Unlike from timbits, from webbits you will not get fat, only distracted. Enjoy !
The Quizstop allows you to select how fast are you reflexes with the mouse. Something for those with competitive gene among us (I mean you Igor, of course ;-).
Different kind of test is on http://jakemandell.com/tonedeaf/ It plays you two tone sequences and your job is to decide whether they are the same or not. Flash required.
Funny geek quotes. Free ebook on Programming in Ruby. Keyboard shortcuts for Mozilla Firefox.Timeline of Linux distros. 50 beautiful CSS designs. Very interesting blog idea - view from your window. Some views would be good as wallpaper, but if you need more variety, try the list of sites with nice wallpapers. Free ebook on Blender.
Few interesting blogs: on data/text mining, visualization and gis, on future of the books, visual communication, and even blog almost without words. Blog about programming in Cocoa environment on OS-X. Another rumor site on all things Apple. If you like better DotNET, look here and here.
Interesting on-line test data generator.
For those of us who have daughters, here is something they (== the girls) may like.