I've actually flown with magnetic media and a full desktop computer. I take several flights a year with a laptop and supporting devices, and I've done a big move like this by plane. Disclaimer: I'm not American, but I'm at school in a US university.
Comartemis: You can ship magnetic media via FedEx - that is an option if you pack the HDDs properly. If it works for NewEgg...
I recommend anti-static bags, if possible, and especially if you disassemble the external drives.
Your laptop and PS3 will be fine, especially if you carry them. Just tell the screener that the laptop and PS3 are coming through. If they're apprehensive or you're paranoid, they may ask for a demonstration that it works by actually turning it on and alternate screening options may be possible. I just went through Terminal 7 at LAX today and Homeland Security had a sign that said to take out game consoles and laptops, and to separate them from other devices. Be patient and courteous with DHS, and ask questions of the DHS people before entering the line to get screened.
Better yet - call the airline and DHS. They can't possibly be worse than CATSA was after DHS pulled a fast one on the Canadian authorities last Christmas and I had to fly.
Having said that, offsite backups are your best friend. Mozy, Dropbox, et al are probably worth it for a month or two to move large quantities of data if it's irreplaceable or very troublesome to replace.
In the future, if you're going to be flying with data - consider SSDs or optical media.
What you don't want to do: make it look like you're trying to evade DHS. They really don't take kindly to that stuff.
Did you make sure your drives were "Parked" after their last use? That is a state where the drive head is semi secured and won't be released until next power on. Most drives do it automatically in proper shutdown of a system but not all externals are configured to do that.
I haven't heard of a hard drive manufactured since 1989 that hasn't parked automatically. Do they still make non-automatically parking hard drives? I need names of manufacturers so I know what not to buy.
I remember there use to be software to check that or even order all the disks into that state if needed but I can't remember the name. A read head that isn't parked is the #1 cause of damage to drives in transit.
I hate to do this, but I'm going to have to call "citation needed". I haven't used parking software since '93 on MS-DOS 4.01, and even then you can't just park a read head and cut the computer's power on a modern OS since the OS has to flush write-back caches.
"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy."
-- Martin Luther King, Jr.