I have been getting a load of PR3 links to my sites lately by uploading funny pictures I find on sites and Google images to http://rate-funny-pictures.com, good thing is you dont have to sign up or give reciprocal back. So far I have done 23 pictures and got links back with keywords that I chose. Works well for my arcade site, may work well for others, bit of a crappy site but PR3 is PR3 lol..... good luck!