I'm sorry that I didn't spot this sooner. I can answer some of your questions.
There are four gymnastics teams that are sent by the sponsor, USA Maccabi/Sports for Israel, which also conducts the trials. The trials were just held on December 7, 2008 in Norman, OK at the Bart Conner Gymnastics Academy. The teams are Mens and Womens Open and Mens and Womens Jr. (high school age).
I can only speak about the women. To make Women's Open, you should be either an NCAA gymnast or a National qualifier to realistically have a chance of making the team. To make the Women's Jr. team, either a Westerns/Easterns qualifier or Level 10.
Results from last weekends trials can be found here:
Link Removed
I don't know of any video of the trials themselves other than whatever is posted by the gymnasts themselves or their parents. You could look at the lists above and then go hunting on Youtube/Google.