Well we all know about the friendslist, but IMs aren't going though for me either.
Also, for a month or two now there has been a lot of IM lag where I don't get IMs from the middle of my conversations, but they will go straight to my email INBOX. I have to log into my email while I'm on logged on SL to make sure I get all my IMs... that's a little weird.
Does that just happen to me?