I use the regular pm notification mod on my personal site, it works well.. tho it tells me if there are new pm's since my last visit. If I don't check them on that visit, it doesn't remind me again. Which is ok, if I don't read them then it's because I didn't want to
Anyways, it works as designed... tho you may want it to check each time.
LK's is the same one, he just has the html set to look like a forum at the bottom of public_forum_summary.pl in the pagebottom area. Check the threads for the code to do that.