With apologies to Rex, here's your new favorite site for the next five minutes: Unicode table for you, from Paul Ford.
There may already be something like it out there, but I couldn't find anything quite like it, and I keep spending time poking around Unicode on Wikipedia and various other sites and finding it hard to get a sense of the whole range of options available.
This is my favorite, "heavy teardrop-spoked pinwheel":
In exchange for the gift Paul gave the web with this page, you should go vote up his panel (well, Zeldman's panel, actually) at SxSW. The gift economy at work!