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other puzzlehunts we can join
Got some ideas for puzzlehunts we can do when it's not Mystery Hunt season.
There's the Melbourne University Mathematics and Statistics Society (MUMS) Puzzle Hunt, which happens around April, and has been going since 2004. http://www.ms.unimelb.edu.au/~mums/puzzlehunt/
There's the CiSRA Puzzle Competition, which so far has only happened for one year, and happened in summer 2011. http://puzzle.cisra.com.au/
Let's hope they do it again in 2012!
And there's the Sydney University Mathematics Society (ΣUMS) Puzzle Hunt, which has been going since 2010 (if not earlier). http://www.maths.usyd.edu.au/u/sums/puzzlehunt/2011/main.html
All three of these hunts use what I guess we can call "Australian rules": Teams of very limited size (each member must be registered), but can use any resources they want (including other people and the internet). Prizes are given (which probably explains why teams have to be officially limited). 20 puzzles, released four or five at a time. Hints for these puzzles are later released. You get points for solving puzzles, but fewer points the more hints have been released. (We're ineligible for prizes unless any of us are Australian, and there may be other conditions.)
If you know of other puzzlehunts that are very friendly to remote solving, please post them!