WorldConnect from Rootsweb
This is by far and away the easiest place to find information. Of course, easy is not always best...
FindAGrave.com
This site is good for finding gravesites
Facebook
Seriously, guys, Facebook is great for genealogy. It's amazing how many of my relatives I've found there.
Family-specific links:
Yahoo Von Nida Group
The Von Nida family forum on yahoo Groups is a good place for von Nida information
Jack Nida's site
Jack Nida (R. J. Nida) is the author of a tome on the Von Nida / Vonada / Nida family
AdamBarner.org
Adam Barner was the patriot ancestor of my fiance, Megan Brooks
Links local to central Pennsylvania:
Obituaries from central PA papers: CDT Altoona Mirror Lock Haven Express
Centre County Genealogy
This site has a bunch of Centre County-related links, message boards, etc. I highly recommend the Pennsylvania Room in Bellefonte while I'm at this.
Penns Valley Genealogy
This site is specifically for Penns Valley, in eastern Centre County. The physical location in Aaronsburg, PA is much more useful than the site!