i've taken mine apart (due to give it another overhaul before rebuilding it again).
you can remove the top hat spacers and give them a scrub and remove dirt/grit from the housing in the chain/seat stays and linkages.
i put a thin layer of LM grease on all of them before re-installing and wipe off any excess that gets pushed back out to stop grit sticking and building up around it all (a wipe with isopropyl alcohol will do).
other than that, there aint much you can do.
i've considered upgrading the bushes to bearings, but i hear they still require some TLC just like the nylon bushes do.
i had some nylon tophat spacers made for me from a section of nylon rod bought off ebay. they work fine and are a lot cheaper than bearings
i'd rather a bit of stiction to be honest - means there isnt any play in your linkages! and under the weight of the rider, i'm not sure (with my kind of riding) that'd i'd really notice a difference or benefit from bearing upgrades.
>Specialized FSR Elite '99: viewtopic.php?t=173952&highlight=
>Diamondback Apex build: viewtopic.php?f=6&t=320993
>FSR frame bearing upgrade project: viewtopic.php?f=41&t=288979
"Happy is my last goal"