Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Hulu Plus is the subscription based big brother to Hulu's free video streaming platform. It costs $7.99 a month, and really does open up the catalog of available titles. In fact, for subscribers, there are many shows that have the complete catalog of episodes from every season.
The other thing Hulu Plus offers is for users to watch their shows outside of their traditional web-only environment. Roku users, PS3 users, and several other hardware based devices can watch their Hulu Plus subscriptions on their television. There are also applications for mobile devices as well, which really open the floodgates for how a person can watch television.
Hulu Plus has its limitations though, and one big one isn't obvious unless you try the devices out.