Different Meditation Techniques have different Brain Effects - Dr. Robert Schneider

I found this to be quite interesting. It shows why you might want to include a basic breath meditation like the one at my blog:
http://karmicbeats.blogspot.com/p/basic-breath-meditation.html

along with the other meditations you do such as:

Chakra Balancing
https://www.youtube.com/playlist?list=PLj6PxS7agDe7OfbOTvnitrj3Gs-6F6J7J

Study, Focus, Concentration, Memory Improvement
http://www.youtube.com/playlist?list=PL1BFF55704C59ACDF

Astral Projection, Lucid Dreaming, OBE, etc.
http://www.youtube.com/playlist?list=PL64CC870B077E1796

3rd Eye, Pineal Gland http://www.youtube.com/playlist?list=PL5E8A447A951DD0FE

Sex
http://www.youtube.com/playlist?list=PLF179724334808485

Sleep
http://www.youtube.com/playlist?list=PL9A1FC6E179E322A3

Misc
https://www.youtube.com/playlist?list=PLE7C7E61C150E4FA3