Me and my friends joke about what is the best possible link and try to think of ways to get on govs, edus etc... I would consider getting an adult link on google's homepage to be the highest achievement and getting a broken link on a dynamic spam page to be the lowest... So whats the highest you've been on the spectrum?
Google should have some sort of contest that the winner's dofollow text link will go on Google's homepage for 24 hours. Could you imagine what that would temporarily do to a site? Not only click-wise but SEO wise.
This is a really good idea and if not for a com---imagine if google put a link to some featured charity or somthing good... the downside is the at the traffic to that site would be so overwhelming as to shut their servers down...
I have several PR7 links to almost every site I run. They're on a very popular software company's discussion board. They're not necessarily relevant links...but still PR7...and I'll be happy to send you the link to where you can get a pr7 link...for 10 million dollars.
I have some travel sites which have links on embassy pages with PR of 4, 5 and 6. I find if you can get links in non profit, government or important info sites is a big help as you will find people will link to these sites alot naturally giving then a higher PR.