I keep tellin friends to watch Durarara and they want to see some previews. Most the trailers I find don't show much. Anyone know a good preview to show someone?

How about an AMV (anime music video) or the opening(s)?
If you want to try the amv idea, here's some that are pretty cool.

https://www.youtube.com/watch?v=jk9o1CwpySM
https://www.youtube.com/watch?v=X4y6kAF0uVU
https://www.youtube.com/watch?v=x9FD29nti4w