First and foremost, the logo must look like it belongs with http://www.cupcake-forum.com/. As long as it fits with that style anything else is negotiable.
Logo should be squarish in orientation, as I intend to place it and several other logos in fancy little frames on the "wallpaper". (that is not to say to logo should be a square, just that it should be roughly equilateral instead of wide) In fact, if your logo already includes the fancy frame around it, I will probably be more likely to choose it.
Must use colors that fit in with/are already present in the existing design.
My original idea was to have the words "Cupcake Forum" arranged in, well, cupcake shape... with "cupcake" written in a fat, swirly script arced on top (or maybe "cup" on one level of frosting, "cake" on another), and "forum" in straight, tall, slightly splayed out letters on the bottom. Naturally my attempts to execute this failed, so I'm open to other ideas as long as they look fabulous with the web page design.
I also considered having a ribbon around the cupcake saying "cupcake-forum.com" so people will know there's a hyphen in the URL, but I'm concerned that might look too busy. And maybe the cupcake could use a cherry or flower on top.
Here are some of the fonts I'd considered for the cupcake shape:
(curvy ones for the "frosting", tall thin ones for the cupcake base)