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This is an issue specific to browsers that use WebKit, namely safari and chrome. Unfortunately we can't do anything about this, though it appears to be fixed in the latest WebKit (used by safari 4 beta)
I made a change such that where possible the browser spell check will be on. Firefox and safari appear to work and provide support. IE6,7,8, chrome and opera don't.
[Edit: Issues, Bugs, and Requested Features should be tracked at Google Code, not here -- matt, 2010-04-23]
Less Wrong is still under construction. Please post any bugs or issues with Less Wrong to this thread. Try to keep each comment thread a clean discussion of each bug or issue.
Requested features... sure, go ahead, but bear in mind we may not be able to implement for a while.