I use the Lucas X-tra Heavy Duty stuff. It's the same color as the Park Polylube, smells like the park Polylube, feels like the Park Polylube, and performs like the Park Polylube. I'm not saying it IS the Park Polylube, but they're both made in America, both seem virtually identical, and the only discernible difference is cost; you'll pay about 4x as much for the stuff wearing the "Park" label. Park doesn't offer specs for their product, but here's a link to the Lucas stuff:
http://lucasoil.com/pdf/TDS_XtraHDGrease.pdf
I run the red lithium grease in my coaster hubs, and on components with a slide or press-in interface (eg, seat posts, bearing cups, respectively)... I use the Lucas Red-n-Tacky, mostly b/c it's convenient to buy a tub of each at the same time. The red stuff has a slightly higher drop point (540dF vs 500dF) so i figure every bit counts for a coaster hub....
Really, while there are greases sold as being bicycle-specific, they're not actually different in terms of spec nor design. And, pretty much ANY kind of real grease is probably overkill for bike use, as the loads and temps for bike bits are still very very low, as compared to most other applications. (An exception is the coaster hub, which does get hott.) Best bet is to run something that is "waterproof" (low percentage of water washout), cheap, and readily available to you. Bearing grease and marine grease of pretty much any sort fit the bill quite nicely.
