Google has had suggestion help for a while — you know, you start typing in a search and Google starts offering you search terms you might want to use. You can try it at http://www.google.com/webhp?complete=1&hl=en .

Now Yahoo has expanded its search suggestion service to Yahoo.com. If you go to Yahoo.com and start typing in a search term, and you’ll get a list of search suggestions. (It seems this takes a few seconds to load — at least it did for me — so don’t start looking for suggestions right away.)

Now I was pretty sure that the search suggestions wouldn’t be the same across the two sites, but I wondered how different they were. Then I remembered that Ask.com did that as well, and decided to do a head-to-head across the three services.

Hmm. Not really sure if I learned anything here except, according to that last search, suggestions can be really, really different….