My friend and I are going to be traveling to Trim in a week and I was wondering what the best way to get there from Dublin would be (train, bus, etc?). Also, where is the cheapest place to stay in town - we are poor college students and aren't looking for a four star place. Thanks for all your help! We can't wait to visit

Cheapest way to travel is by bus (there's no train since about 1947). CIE (Dublin Bus) leaves from the Busaras, Store Street in Dublin.

Cheapest place to stay is probably the hostel :
http://www.hostels-ireland.com/microsite.php?MailingListID=151 or one of the B&Bs - see the links page.