Be sure to check out /u/Aiwayume's Guide to Finding Contests Part 1 and now Part 2
Go Here to see list of contests ending this week.
Oct 26: SweepsDB We have created a new website for listing contests. You can sort and filter the results. Check it out @ SweepsDB.com
Aug 25: End Dates When you submit Gleam contests, it will display the end date and include it in the title when you push the 'With Title' link