What's the service like outside the USA?
I ran a search for players/campaigns in the Heidelberg, Germany area (still working under the assumption I'll be moving there some time this year) and came up with a couple of each. The PPG partnering with Obsidian worked well in that regard -- two Obsidian campaigns were returned in the PPG search.
On that (tangential) note, the Obsidian site looks useful. I've set up websites for my own campaigns in the past because I've wanted an online source for my players to reference; that's a pain in the ass to manage, though. The Obsidian site provides a relatively simple online campaign management tool for the GM/players, including message boards and a wiki.