[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.
In the absence of other contact information, there should perhaps be a way to send/receive personal messages. This would allow non-public comments regarding comments/articles (to point out typographical errors or make an off-topic suggestion, for example).
You can do this.
Having said that. This feature was inherited from Reddit and hasn't been fully integrated into the new design so I don't think the recipient will actually be notified. They would have to know to check for new messages.