I've been dabbling in metta meditation recently. I haven't changed my opinion - also known as lovingkindness meditation, it remains one of the finest things you can do with your mind. The results you can get in just a few weeks are indescribable.
If you did nothing else - no self-hypnosis, no other meditation - you'd become a happier, healthier, amazing person in a few months.
I should know. After a recent revelation with it, I've felt pretty amazing.