Stay clear of Yahoo! domains! I'm not just saying this because I had a bad experience even though I did. I've found many other people that cannot get support. In my case there was something wrong with their DNS server and 50% of the time a surfer would just get the standard "Under Construction Page". 50% of the time they would get my web site. After countless calls and emails I finally gave up and paid a third party to host my DNS.
I have read about many people who simply cannot transfer their domain name. Yahoo! isn't even the true registrar. It is some company in Australia and they have worked it out with Yahoo! so that all transfers get lost in communication between the two companies. In frustration, some people have just let their domains expire and hope like heck that some squatter doesn't snap it up before they can reregister it. All in all, a Yahoo domain at 2.99 is a lot more expensive than a GoDaddy domain at 6.95.