I am the webmaster for a _____ site and I own both the .com and .net extensions for the domain. The site is hosted at .net and every url is reachable via .com also. I have been a freelance webdesigner for years now yet have just recently started to build websites where the SE placement is key to site survival. I have spent alot of time here at these forums and also analyzed the competion and have gained many first page rankings for many key secondary keywords. I have had a bit of trouble ranking for the primary keywords and I have thus began to re-optimize my site accordingly.
Now to the issue.. I recently noticed two different PR's for my index page when accessed from the .net or the .com, the .net shows a PR of 0 and with .net/index.php shows a PR of 3. The .com shows a PR of 4 and .com/index.php shows a PR of 3.
As I said I am still learning when it comes to SEO yet it seems to me that this whole dual extension and url masking thing may be hurting my rankings.
If anyone would like the url send me a sticky. Please keep all replies in this thread.