A thread I can relate to at WebmasterWorld is named #1 in Yahoo but No Traffic. I hold the number one position for a few top keyword phrases that, according to Overture's keyword suggestion tool, gets over 3,000 searches per day. And guess what, I may get five to ten referrals from it per day. The member at the thread reports the same;
We've jumped up to between #1 to #3 in Yahoo for the last week for a two word phrase that has 100k+ searches per month according to Overture, #*$!, and other sources. But our logs show almost no change in traffic.
Not only that, other members report the same thing.
In theory, I believe the more technology related the search phrase the less likely people are going to search on it at Yahoo! The less likely they will click on your result. An other member reports the same for niche travel industries.
Moderator Tigger adds;
I've been ranking at 2nd for years on Y for some of my main money terms and the problem I think is the SE just doesn't get used much. The same keyword when I was ;0( ranking on G pulled in 300-400 searches a day (same place 2nd) on Y I'm lucky if it pulls in 10 - its just a numbers game and Y just doesn't have the traffic.
Forum discussion at WebmasterWorld.