I must admit I've been derelict in helping the sick. As far as that goes, I'd recommend programs that show LOVE, not condemnation, to those suffering from HIV/AIDS.
My efforts have been more focused on the "prevention" end of things. I've led many small groups at my church focused on helping people struggling with issues of sexual brokenness (including but not limited to homosexuality) overcome those issues. My experience, however, has convinced me that such people need to be shown God's love. Condemnation from Christians has often proven to be the biggest barrier to them seeking help in the first place.