Difference between letters

[crow00]

I've noticed that there is a difference between capital and small letters in google search.
I've found a URL which's PR is 3 in capital letters and PR0 in small letters.
Can anyone explain me what's the matter. Is Google optimizes his engine under capital letters or what??
Thank You

[crow00]

http://www.tygo.com/Dir/Real_Estate/
http://www.tygo.com/dir/real_estate/
Here are the URLs. The one with capital letters shows PR3, and the second one shows PR0.

[link.ezer.com]

tell you what....

you may use it to check PR
http://link.ezer.com/tools/pagerank_checker.asp

it is all same for all websites
http://www.SUBMITExpress.com/bbs/ ....pr6
http://www.submitexpress.com/BBS/ ....pr0
http://link.ezer.com/tools/ ...pr3
http://link.ezer.com/Tools/ ...pr0
or tipical example:: Dmoz

capital letters in domain name is ok
but in folders they will be very different for G PR

it is better for you only use one style URL to create href or submit URL ....
I prefer not to use any capital letters

[AfricanMango1]

It's just that Google is case sentitive at the time of indexing the URLs. So the same URL with capitals and lower case are two different URLs. Apart of the PR thing, the real problem about this is that you can be penalised for duplicate content, as you would be giving two different URLs with the same content.