1st.ly : prcheck

TIPS

Max number of URLs: 50 at a time
Just split your list into smaller chunks.
One URL per line or separate with spaces or commas.
Both www and no-www flavor of URLs will be checked: no need to enter "www.xyz.com", "xyz.com" is just enough.
Only host part (domain) of URLs will be checked: "xyz.com/1/2/3.html" will be stripped down to "xyz.com"
Clicking on will bring up a window with Google Backlinks, Expiry Date, major TLDs availability and more...
Note: if you check a lot of domains during short time Google will block your "URL:info" requests resulting in many indicators shown. In this case you will have to check the validity of PR manually by clicking this icon or check link.

PageRank Checker

PR Validity indicators:

valid: PR is valid at the moment

invalid: PR not valid - which typically means the domain was redirecting (301,302) users to another URL. You can see real URL by hovering over invalid link

check: PR status unknown - Google blocked the request (rate limiting).
You can still check the validity by clicking on the check link and looking at Google "info:" results (in a new tab): if it has the same URL (with or without "www") as the URL you are checking, PR is valid

no data: Google has at the moment no info on where the URL is actually pointing to - just check later again (can take days for Google to update its DB though)