I have been branching out a bit and playing a bit more non-Hold'em tourneys lately. I really enjoy Pot Limit Omaha and Omaha 8 tourneys and last night I tried my first 5 Card draw tourney. I really like the game. There is a lot more bluffing after the draw, it is usually right to take a stab at the pot but then fold to a raise if you do not have trips or better.
It is also interesting when someone stands pat with their hand and does not draw. Usually this means that they were dealt a flush or straight, but it also is a very interesting bluffing opportunity if played correctly and the betting levels are high enough relative to stacks (in other words someone won't call you just to see what you have).
Pokerstars is the best site to try these other games because they have a lot of $5 buy in tourneys on the half hours for non-Hold'em games. They get between 100 and 500 players and are great places to practice.
I also really enjoy the Horse tourneys on Full Tilt. They have several every hour. Horse is a nice challenging game because the game rotates from Hold'em to Omaha to Razz (lowball) and finally Stud. It keeps you on your toes and continually learning.
If you are getting bored with NLHE, give these other games a chance and rekindle your love of poker.