Finding that cheap flight south

I'm always on the lookout for some cheap flights south, a site that I recently found very useful is Kayak.com. When you submit a search the site goes out to all other airline sites and finds all possible prices. Once you have your results, the site give you lots of options to filter the results on. Some examples are

- Easily check off which airlines you're interested in
- Select the number of stops you're willing to make during your flight
- Move a sliding bar to quickly filter on departure times and flight length
- Filter out airports you're not interested in with a click of a mouse

Other features of the site are searching for

- Hotels
- Cars
- Cruises

Good luck on your searching for that deal..