Including me.

Excellent Free Tool.
http://www.ccleaner.com/

Some already mentioned, some not...

Great Free tools...

Mostly Free!

http://www.primopdf.com/
http://www.pdf995.com/
http://www.cutepdf.com/
http://www.pdfonline.com/
http://www.openoffice.org/
http://www.abisource.com/
http://www.jarte.com/

A few other good research and Search resources...

I'm sure we'll see a few more...

http://www.resourceshelf.com/
http://www.turboscout.com/
http://www.whonu.com/

Phil