Weddingbee boards

Here's a pretty comprehensive list: http://www.emilypost.com/planning-your-wedding/414-traditionally-who-pays-for-what

It is kind if hard to broach the subject though - they are going to pay (or not pay) for whatever they want.  In my experience and that of friends, I've only seen the groom's side pay for the rehearsal dinner and occasionally liquor/open bar.

I think this is a touchy subject, but I think a general rule of thumb is that it's probably a bad idea to show up to the groom's family with a list in your hand telling them what they traditionally pay for.  I think you should wait for them to offer to pay for certain things or give a certain amount, otherwise plan the wedding you can afford on your own without their help. 

When it comes to tradition, pretty much anything goes these days!