Many of them are quite a few years old, but this is probably the best compilation of guerilla marketing ideas out there:
I am badly hooked on the series „lost„, as I wrote in my German Blog already. The sixth and supposedly last season started yesterday in the US (the parts are available in Germany always one day later), however in the last couple of days / weeks a few marketing gigs have already taken place. Such as this one: you can book a flight on Oceanic 815 from Sydney to L.A. on kayak.com – for a horrendous price, of course. Quite a nice idea!