It sounds like the pressure plate has about had it. Many times the Pressure plate goes bad and doesn't completely disengage the transmission from the engine. What happens is you will grind gears when shifting and it will be very hard to put the vehicle in any gear with the engine running and the vehicle stopped. If you took care of the transmission with regular maintenance and didn't "pound" on it, most likely a manual transmission will outlast the vehicle.
One final thing. Did you check both the clutch fluid level and the transmission fluid level? Either one of them could cause a similar problem.
Let me know if you have any specific questions.
Joe
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Tuesday, September 30th, 2008 AT 1:20 PM