I've always wanted to use one, but the fact that very few domain hack startups have taken off keeps me away. last.fm and del.icio.us are the best examples I ca

I've always wanted to use one, but the fact that very few domain hack startups have taken off keeps me away. last.fm and del.icio.us are the best examples I can come up with of successful startups with domain hacks, and I don't think del.icio.us was ever a huge hit outside of the tech world. Plus they both ended up buying/switching to the dot coms anyway.