Take the Wordsquare Challenge : needs Java Another brick in the wall? : needs Java
Enter our prize caption competition
Try a tricky picture puzzle The sticky words challenge - can you solve it?
Automated anagrams. Check 'em out.
These diversions were devised in 1999 for "", the original Cambridge School Classics Project website (now at Amazingly they still work in 2011 - though they may seem a bit slow.(And the caption competition closed a decade or more ago!)