Sgt_Kickaxe - 12:47 am on Jul 8, 2011 (gmt 0)
...sites with lots of broken links suffer some sort of negative when it comes to rankings in Google.
No sir. If that was the case I could write a TON of links that I make up, all looking like example.com/aishfuihniufnoiansiodnoqwe.html. It's broken links leading OUT from your site you need to worry about.
Also, Google starts a history for EVERY SINGLE URL you have from almost the moment you publish it. If you have a high percentage of pages that disappear over time it might become a problem. Incoming links to non existent pages never will be, too easily manipulated.