Nice informative link on the crit cap.
A rogue friend of mine showed me a picture of himself pre-BC
with over 55% tooltip chance to crit, most of it was probably wasted then.
According to the wowwiki page then, assuming you are hit capped
and attacking from behind on a boss, crit cap will be
100% - 5.6% (dodge) - 25% (glancing) = 69.4% crit
which when I think about it can be increased even further with expertise
Capping out expertise (23 expertise, 91 rating) is quite unlikely for a druid
but would raise the crit cap to 75%.
A common weapon Earthwarden gives 6 expertise skill which reduces the mobs chance
to dodge/parry by 1.5%.
100% - 4.1% (dodge) - 25% (glancing) = 70.9% crit
Edited, Jan 22nd 2008 4:49pm by Kefas