Shooting Video with Nikon D5000 Shot length

I got the Nikon D5000 to do short films etc on a low budget, as it was quite a cheap decent camera, the one thing that I'm now worrying over is the 5 minute limit when recording 720p, now i know on lower settings it has a 20 minute limit, but i want to shoot 720p. The main issue are shot lengths, such as when filming a relatively long dialogue scene from one angle, what if the limit suddenly cuts the recording? Anyone have any suggestions how to overcome this?

Added (1). I'm happy shooting in lower resolutions, but if there's a way to help overcome the limit it would be helpful.

Okay.

Something that people who are new to video may not understand is that most video is shot in increments of two to three minute "takes" and are then assembled with an editing program to make a "full length video" what ever that turns out to be

There are some limits to using a dSLR camera to shoot video.

1) a CMOS sensor gets hot after while and this can limit the time you can record a single take
2) the FAT32 file format used by memory cards are limited to single file sizes of 4 gb minus 1 byte.

If you shoot from a script and keep your takes to segments less than 5 minutes, you will be much more successful producing video

As you can see, the limits are NOT arbitrary, but physical, so the only way to shoot long takes is to use a proper video camera using 3-CCD sensors and recording to tape, P2 or a hard drive.

What is the size of your memory card? It creates video of length 15 mins if you have a 4GB card in it. I'm using 8 GB card in my Nikon Coolpix S3100 and it can create movie clip up to 24 mins.

There's no way to shoot 720p longer than 5 minutes on the D5000. The only workaround is to buy an actual video camera. DSLR's are not meant to shoot video. They are for still images. The CMOS sensor tends to overheat quickly and the quality of the video is inferior to any proper HD video camera.

Anyway, I don't see why the 5 minutes are so limiting. Do you really want to shoot a scene in one take for 5 minutes? That would be VERY amateur like and extremely boring to watch.
Look at the movies you see on TV. You will never find a 5 minute scene in one shot without cuts.

If it's a long dialogue (btw you should probably keep the dialog shorter than that), have a shot where the people meet, then cut to a close up of the talking persons face, then cut to the other person, then cut to a wider angle where you see them both etc etc…

These are just suggestions. Of course it depends on the shot, but you need to keep it interesting. It's very boring watching the same scene for 5 minutes from the same angle without cuts or anything. Even 2 minutes is way too long if it's just a dialogue.
I recommend watching pro movies and paying attention to the camera work, angles and cuts. It really improves the quality of a shot significantly.

Thats why you should get a Canon. Canon doesn't have a 20min or 5 min limit…

it might be the problem with your memory card, buy a better one, for expamle, the SanDisk Extreme Pro 32GB