Simple!
Stuff you need:
An animating program(must be able to make GIFs or FLVs)
How:
1. Open program.
2. Create the intro.
If you don't have Flash:
1. Open paint.
2. Get a picture of your logo.
3. Save image in a new folder called "intro".
4. Save it inside there.
5. Edit the picture to change it some way (e.g; Bigger, Smaller, Move off screen).
Only a little bit. Just like this
.6.Save.
7. Repeat till logo disapears.
8. Go to
http://www.iaza.com and select "Frame Animation", and upload them in order.
9. Put your gif at the start of the video.
If you are to lazy/busy to do this I could help.
BUT I WOULD WANT CREDIT.