enhancing google adsense

well not only Google u should try Yahoo / Chikita also..

and aproch to other organization and comapnies for dedicated ads... not just relay upon Google...

is that allowed
does google allows it
will it effect my current earning..negatively...

does other service allows that kind of things..
i have not seen many sites with this..kind of thing
what can be disadvantages...

YPN is not allowed with google, moreover it is not available outside USA, also chitika will not accept your traffic.

Earning through adsense is all about position, if you ad is at right position you will get more clicks and more earning.

Why don't you use some good affiliate program. Saying south asian visitor not buying online much is wrong, many successful ecommerce sites are running in this region.

Well currently stick with Adsense...tweak your site and experiment with different ad formats. certain ad formats give more click rates. And don't shift your advertiser...I tried Bidvertiser, Chitika, Clicksor and Adbrite but wasn't successful...only Adsense worked for me!

change ur ad formats, always try to add new material, advertise ur site, put relevant ads