Infolinks is the one of the best Contextual ad network for publishers ,
for me infolinks worked great, and i recommend it for new comers in blogging.
Here am sharing some tips to increase your earnings with infolinks

Add “Related Tags” code near to your website’s “related posts” or above the comments.
In “advanced integration wizard “ ,

Set links highlight color to blue,red,green or some thing bright (default blue works great)

set your “underline” to dotted (will look like link to an another post)
Set max number of links per page to 12
set “content category” most related to your site
Make sure that you updated the ad code on your website after making changes!.
Infolinks earning not much impressive now, for the last few months my earnings dropped pathetically, but this month its not too bad.
Thanx M8 Nice Tips And Info I Also Use It
Infolinks does not give more revenue .then why use this one .use google link unit .I am using this and getting CTR about 6% .so use adsense
yes you are right , infolinks sucks
me also don’t like infolinks for tjis reason.