Yeah, Ibercivis is a nightmare, but their research projects are very interesting imo. It's like World Community Grid, but with different/more interesting projects. Workunits are tight though - only 48 hours turnaround! They only take an hour of crunching on my rig though though, so it's not too bad. But when SETI gives me 6 weeks, it's a bit of a shock to the system!
SIMAP is pretty popular, but the lab only generates workunits once a month, so when they're gone, the project lays dormant until the next lot comes out on the 1st of the month
Edit: I can't join the SIMAP team for some reason, there's no 'Join This Team' link
I've had this before with other projects, I'll figure it out later