I noticed Magento was kind enough to remind me that I need to update the M2E Ebay Store Extension. I did so through Magento Connect and now I get nothing but blank pages on both the front end and admin end of the site so I'm stuck with blank pages and not sure what to do. I appreciate any help!
Ang, in comment you confirmed solution which worked for you, I would like to sum this up. It looks you might forgot to disable compilation before you installed new extension.
You should remember to always disable compilation before you install any extension. Disabling all caches for the time you are installing extension could also be good idea and help in a few cases.
You can disable compilation in
System -> Tools -> Compilation by using