Google is the most difficult search engine to do search engine optimisation for, but potentially can bring the most traffic.

Yahoo is the slowest of the search engines to index, but high rankings can bring good traffic and is worth optimising for.

Launched in June 2009, Bing is a huge improvement over Live in terms of relevancy and traffic

Ask about other search engines here such as AOL Ask.com Overture etc. Some of these search engines waste bandwidth and should be blocked, others bring welcome traffic.

Here you can discuss SEO software or can share any cool online SEO tools you come across.