Today I'm parked at Morro Dunes RV Park in Morro Bay. They have free WiFi that is excellent. I'm currently watching Torchwood on Netflix, while also uploading several large photos to flickr. It's not the 20-something Mbits I had in Mountain View via Comcast, but it's perfectly usable, and fast enough for everything I need to do, including repository syncs of our software. It has also been reliable all day, and Netflix streams have been completely smooth and without interruption for the couple of hours total I've been watching and working.
The KOA I stayed at in Monterey had very expensive ($14.95/day) and very slow/spotty Internet, though, so I don't expect Internet to be an easy problem everywhere. But, finding great Internet here in Morro Bay is encouraging, as this is a small town, not renowned for technology.
When I parked on the street when first arriving last night, I used my G1 tethered via PdaNet. But, there's no 3G here, so it was really slow. Pretty much just good enough for checking for urgent email. So, boondocking (just parking wherever and living wholly off-the-grid) will probably be limited to weekends, and possibly 3G-enabled areas. PdaNet also only runs under Windows, so I can't run Linux natively while using it; which means I have to virtualize for development (our software is a Linux/UNIX-only product).