Memory card help

I downloaded 2 movies today and was getting ready to add another movie
and it said-not enough space available...
How can i free up space on my SD card so i can add more movies?
I thought a 2gb SD card can hold up to 4-5 movies.. am i correct? if i am, how can i fix this?
the SD card i have was given to me @ d tmobile store as the one that came with my phone was returned as it was faulty.
thanks for your help!

To add to what booboo773 said: If you're getting your movies from my thread ("100% FREE MOVIES"), use it like the database it is. It's not going anywhere so feel free to delete to make space to download another movie. Besides, you can only watch one film per battery charge and there's no continuous video playlist feature on the Behold so 3 files are really all you need. If that's not good enough, simply purchase an 8GB SD card so you can have a larger selection on your phone.

*Also... Read the beginning of the movie thread where the rules are. It details how to save all your downloads to a DVD for later use. This way, intead of waiting for MegaUpload's slow download, you'll already have it saved... just pop in the DVD, yank the file off & go!

I can watch 2 as well but for the most part, one is a definate. Once I look at the battery meter, it's down to 2 bars. Sometimes it squeezes in another film but it's rare that I try it. The only flaw the phone has to me is the battery sucks. Wish it was 4hrs like my PSP 3000 or a whopping 8hrs like my PSP 1000.