Reddit List - Tracking the top 5000 subreddits
Better History - Your Chrome Browsing history. Better.
Reddit Check - A tool to check if a URL is on Reddit and going viral
History Search - History Search remembers what's on all those websites you visit so you can find them again.
FindAReddit - Find subreddit for your niche
DealExtreme - Online shopping for cool gadgets at the right price.