love em all. favorites are albolene, stroke 29, jack jelly, id glide, and the silicones. currently trying out something called maximus -- it's a gel that's pretty good. i'm a medium precummer, and it's mixing quite well.
For Fleshlight and Tenga Flip use, nothing beats the generic version of Astroglide sold at CVS. This stuff is amazing -- it feels like really thick precum, lasts forever, and provides one of the smoothest rides I've ever had.
One product I do not recommend at all is Liquid Silk. This was recomended to me by the guy at my local Pleasure Chest, and it was awful. I almost want to say it was gritty. Couldn't even cum with it -- and believe me, I tried. Edged for about 3 hours, dumped most of the bottle in an attempt to feel lubricated, and ended up slathering on something else for the money shot.