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One of my biggest problems with Google Wave has been that there was no easy way to know if you had a new wave (besides checking Google Wave). Now, there are solutions to this problem:
“You’ve Got Waves”: How to Get Google Wave Notifications — Google Wave — Lifehacker.
A lot of improvements. I’m looking forward to all of the new theming features, especially being able to create templates called category-portfolio.php instead of resorting to category-{id}.php
Version 2.9 « WordPress Codex.