A simple way to view YouTube videos.
Film List lets you view upcoming movies, watch trailers, and build a personal film list of movies you want to watch.
Retail Me Not
I'm always using retailmenot.com to look up coupons for online stores I'm busy buying stuff from, but I find it tedious to have to open a new tab for retail me not, copy just the domain, and then paste it into retailmenot.com.
So I made a simple bookmarklet which will grab the store's domain and open a new window with retailmenot.com for that site.
Just drag the above Retail Me Not link onto your browser's bookmarks bar.