What kind of online advertising gets your attention most?  

I believe that facebook is the greatest way to advertise. You can easily find your targeted group (through interests, age, country etc) and the prices are not THAT much for having that quality advertising.

i think associated with free stuff and associated with money

I like twitter ads. we can monetize our account easily with tweetads and earn from them with free stuff, but we have lot of followers to do this. Face book is also nice. For better results placing ads to ptc sites will attract many persons, because many people are using ptc as their earning solution.

Ads by Google. The reason may be is because they are more targeted. Let's say for example, the kind of sites I usually frequents are related to home-based Internet business and internet income opportunities, that my interest are being matched by Google Adwords to their database of ads and advertisers. That will also be the reason why in the future i will advertise with Google Adwords. It's very effective.

Actually, the kind of advertising that gets my attention first is the pop-up ad kind. Some places now use pop-up video advertisements, and that's a sure way to get my attention (because I usually can't close the video out until the commercial video loads.) It's quite annoying, to be honest. However, I do admit that I remember the products being advertised more that way.

anything related to free