Little bit off topic but this site has some great marinade and bbq'g recipes.
http://www.grillpro.com/grillpro/recipe.asp?CID=6
One of my favorites from last year is the Salsa ribs. I marinated those ribs for over two days but they were fantastic.
If you're going to do a lot of marinating, I suggest getting one of those tupperware marinating containors. The base and lid seal shut and have pointy ridges on them so you can flip the meat over to marinate the whole piece(s). I marinate lots of steaks in the summer for bbq'g and with any marinating I make/use, I always marinate the steaks at least overnight and normally a full day.
Edit: Sorry, for more recipes on the website, scroll over the 'On the Grill' link/heading in the upper right and a drop down box with recipes will appear.