I am establishing a 30-team free dynasty league hosted on Proboards and scored on ESPN. We have filled around half the teams and are looking for dedicated GMs to take over the remaining teams. As a brand new league, you will have the opportunity to steer a team from the beginning rather than taking over someone else's leftovers.
The league attempts to replicate the GM experience as closely as possible and, as such, has a relatively detailed rule system. Hence, this league will require more than just setting lineups and forgetting. We have multiple drafts annually (rule 5, rule 4, and minor league free agent draft), 25 man roster (22 active / 3 bench) and 90 man minor league systems.
If you think you're up for a challenge and are interested in looking at the league site, reply or send private message.