Graphite in small doses is fine. If its used too much it can get caked up. There are many fine aerosal lubes that work too. WD40 is a good generic lube. Gun lubes are nice because they don't leave any residue. Get one of the tiny spray bottles of WD40 and keep it with yout gear. Another option is to get a small flip top plastic container and put in some lube. It only takes a drop or two per biner.
Tom
Strong limbs and single ropes! canopytree@earth_link_.net
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Then here's to the oak, the brave old oak,
Who stands in his pride alone!
And still flourish he, a hale green tree,
When a hundred years are gone!
--Henry Fothergill Chorley, "The Brave Old Oak"