It records either .3gp (3GP) format or .mp4 (MP4) format. You can change them in the settings if you press menu, scroll all the way to settings and you will find it.
i have the matrix and i love it! its sooo cool how it has the dual slider feature (unlike my friends phone, hers has a full keyboard but its tooo confusing cause its all jumbled up :p). att doesnt have very many good phones in my oppinion so when i got a phone i had to chose between the matrix or the propel 2.
you can reset you password for propell (SGH-A767) by using this master reset code: *3767*3855# i am not sure if you type it in as if you were going to make a call or to find a special reset area. but be careful this will TOTALY reset you phone so be very careful to store your info on an sd card or something