You may already have seen it, but in case you haven't: LJ made an administrative posting yesterday saying that e-mail notifications of comments are currently broken, but that they are storing the info and will catch up on the e-mails once they fix their bug.
Me too. I just heard about http://www.livejournal.com/tools/recent_comments.bml, which supposedly will show you all of them even if notifications aren't going out; I think I'll start checking that regularly.
It is, but bear in mind they do not consider a comment "received" unless it is in your journal, so it won't show replies to your comments in other journals.
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