monotizing Facebook membership site

I have a free service that I deliver online for facebook on wich I have around 1500 registered email adresses and constantly growing. I'm looking for a way to monotize this, but not really sure how...
I've already tried offering software development services but no response.
I think it's too expensive...

looking to give away or sell something weekly for a small amount but don't know how to get something cheap that I can offer.
I want to build some trust aswell...

Does anyone have any suggestions...

JV's are also okey for me....
You deliver weekly something that we can sell for cheap and we split the profits....


Edit: could do something with plr articles but more info is always welcome... and also looking for possible other ways of monotizing... thanks


Hints and tips are welcome...

sounds interesting. can you send me more details. I can offer scripts,facebook apps etc.