The best replacement for adwords is adsense.

The best alternatives to adwords are rated as following:
★★★★★  adsense
★★  seo
★★  facebook
★★  adwords express
★★  adcenter
★★  overture
★  keywords
★  doubleclick
★  bing
★  facebook ads
★  analytics
★  ppc
★  admob
  display network
  yelp
  search marketing
  sponsored search
  adbrite
  google adsense
  yellow pages
  yahoo adwords
  google analytics
  yahoo search marketing
  banner ads
  google adwords
  yahoo overture
  product listing ads

Your alternative for adwords is not listed? Suggest!
Speaking about adwords, one probably shouldn't forget about analytics.

Other search terms related to adwords and their ratings are:
★★★★★ analytics
★★★ clickbank
★ seo
★ affiliate marketing
affiliate links
You have in mind a companion for adwords and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of adwords in all years. Click on graph for more.
adwords
adsense
seo