Online travel agencies

I just did a search for a round-trip international jaunt at this site: Hotwire. They came up with what looked like a really good quote–half of what I had expected–but I still feel a little queasy about allowing them to charge my credit card when I don’t really know who they are or what their track record is. Has anyone ever used this service, or can recommend a good alternative?

Thanks,

Zarathustra

I’ve never used Hotwire, but I’ve used http://www.travelocity.com a number of times and always been happy - no problems.