Here's a couple threads about the premium position:
First thread on the subject:
[webmasterworld.com...]Message 24 in this one has some awa info:
[webmasterworld.com...]Quoted from [webmasterworld.com...]
The short answer: Yes, those ads are from the AdWords program - and the best way to get to the top is to work on creating especially relevant ads/keywords (i.e. having an especially good CTR).
AWA
A 6,5% CTR would be enough? Can't do it better than that still!
silverbytes, a 6.5% CTR, while really excellent, is not exceptionally high. (In fact, double digit CTRs are not at all uncommon.)
If you do a site search you'll see that this topic has been discussed dozens of times in the past. Perhaps some of those threads will give you the piece of insight you're looking for.
By the way, ads must also have been reviewed and approved in order to be sent to the top spots.
I do wish you the best of success in getting into the top spots!
AWA