I got my 20D two days ago and I loved this camera. This is my first DSLR and I impressed with the good results.
I believe that we will get good housings for the EOS20D in short time. Aquatica, Ikelite, Subal and Uk-Germany, all these manufacturers already had announced that these housing will be available for the end of the year.
Just wait more couple months to get undewater your 20D.
Cheers
Fabio Amorim
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EOS Elan7e + Ikelite housing+SB105 strobes and Powershot A80+Canon housing
EOS20D + waiting for aquatica housing
Canon Lenses for UW use: 20mm, 50mm+life size converter
Tokina 19-35mm