It's not bad but I still think a counter by what's new is the best solution. The moment your members see some numbers you'll get use from the what's new. Me personally? I use the what's new all the time it's one of the few navigation features I use alot and find very very useful. I think the introduction of a new post count would just make the what's new that little better and more appealing plus you could always change the "what's new" phrase to "New posts" or something similar.
Infact Jake is this possible to introduce a counter when new posts are posted on the the right hand side of the what's new? text? Apologies for hijacking your thread Stimo.