users

Hi

I am new to wordpress and loving it!! I am developing a church website – I would like to be able to allow some posts to be only seen by groups of users. I am therefore looking at a plug in that will:

1. Restrict access to certain posts
2. group people so i don’t have to pick them individually.

I can’t use the existing user structure for various reasons.

I had thought of using wordpress mu but unsure that isn’t a bit ott!!