Check this one out, its great fun once you get arranging friendlies with your mates. New features are added regularly and the game is still in beta!

Go to http://www.sundayleague.com/
It is the way to get directly to the site described by Kieran in his Everton Sunday League review.

May I add that I also think this game is superb. It is surely the best free football management game online.
Hugely playble, addictive, challenging and humourous.
Get registered now!

Accessable through the Everton FC Website http://www.evertonfc.com/ Sunday League Football is an addictive and enjoyable football management game you will find anywhere on the net.
Register FREE to be allocated a team and then prepare to hang on through the trials and tribulations of managing a group of amateur footballers through mud, bad referees and hangovers.
Once you start playing this game you will find it very hard to stop. Your morning at work will begin with a check as to how your team has faired (games are played through the night) and your day will be ruined or made much better as a result.
For a free online game the player as many options. You can set tactics in a number of ways. You can view match reports for every match that has taken place, spy on your opponents team tactics and plot to sign new players.
An affilation to Everton is not a requirement to play this game, you can even display which team you follow in real life as part of your user screen.
Players names are made up, not based on real ones, but you can customise them to be more familiar to you.
I highly recommend this game as a way to spend spare time on the net.
Just make sure it doesn't take you over!