I persevered with mine for quite some time until I eventually got to the point where I thought it might never turn again - I went to a locksmith known for fixing these (in Perth anyway) and $80 later the barrel's funcitoning beautifully 2 years down the track.
I know replacement is a very safe option, but if you get a good 'smith it could sort you out for sometime to come...
As DM sadi, in the meantime some dry lube like graphite powder may at least get your windows up and somewhere safe.
Good luck
Cheers
Mike
'00 D2 Td5 'Alice'
'03 V6 Freelander 'Phoebe'
'04 Td4 Freelander 'Harry'
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