I recently discovered a awesome Affiliate Marketing / Adwords PPC marketing blog - Software Projects! The people who run the blog have a $3 million monthly PPC budget. Obviously when you are pushing $3 million worth of PPC traffic a month - you have some idea of what PPC is all about, so I intend to learn all I can from them Here is a screen shot recently posted on their blog from their Google Adwords account:
They post on topics like:
...and a ton more. Their blog is UGLY, but the information in it is quite valuable!
Affiliate Marketing