Is there a good website with SQL Index tips?

I've created a few indexes on my tables but before I over-do it I wanted to see if there were any good websites out there with recommendations. My plan is to create clustered indexes on my primary keys and non-clustered for each foreign key. Also there are a few fields that are regularly searched so I will index them separately as well.

I don't want too many though because I know that affects the performance of record inserts. I'm also not sure about using multiple keys in one index.

Is there a good site out there with tips on what indexes to create or avoid, or have I pretty much covered it?Try this article:

http://www.sql-server-performance.com/optimizing_indexes.aspsql