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were you rooted or lagfixed or anything?
should still be able to fix it
How to unbrick the totally bricked Captivate - xda-developers
reset the date back to normal.
then rename /dbdata/databases/wssdmdatabase.db
reboot
see if that works - this *should* also work in resetting your chance to check for an update without changing the date
Complete Stock was warranty exchange 2 weeks ago. Battery was almost full.
Update started got to almost 50 % and then the phone went black. No warning, just like the screen timed out. I waited a few minutes and nothing. Waited a few more minutes still nothing. Tried turning it on, took out battery, put back in, absolutely nothing. Tried plugging in phone just in case.
Anyone else with this issue or am I just so very special? Thought I would check here real quick before calling AT&T. I spent enough time with all them before they finally warrantied out my phone.
Had a scare there for about 10 min. The phone paused at 50% also, then 2 min later finally finished, rebooted, stayed at the Samsung Galaxy "S" screen for more than 10 min. I thought the phone was bricked. I panicked and walked out to calm down and "Wompa" I see this message "Congratulations! New sofware update for phone installed. Phone is ready for use" **Phone is working like a charm**. Now to check the GPS status. Will post update. 
Terrifying. I just got my Captivate yesterday and I'm excited about this update, but I've had terrible experiences with phone updates and this is just not encouraging to hear.
It's a true YMMV scenario. There are quite a few varying results. If you'd like some encouragement, downloading the update took me about 45 minutes because I'm on EDGE (not personally). Then the actual update stopped at 50% for a couple of minutes and proceeded to completion. The reboot hung at the glowing "S" for about 10 minutes, then the home screen appeared successfully.
GPS? Well, I haven't checked every 10 minutes for updates since I believed that the fix would come in due time. It's never been a biggie for me. I'm pretty patient - except for unreasonable people. That said, I tested it and it's fast and accurate to within about 30 feet.
Encouraged?
Beware of the perpetual naysayers. Some folks aren't happy unless they aren't happy.

Is it possible to download the update over WiFi or it only downloads over the network?
If it is a big download, I would prefer to wait until I get back home (no open WiFi in the office) to download and update.
ok i have youre exact problem, just a dead phone. did you find anything out?
I'm not rooted....
Oh don't get me wrong I'm absolutely loving the phone! I live and study in downtown Atlanta so I'm never wanting for a lock on my location with wifi. I'll just be waiting a few days to see what the general consensus on the update turns out to be. I have no pressing need to update and certainly no need for a useless phone for any period of time.
Coming from a Blackberry 8320 (which I never was able to actually update the OS on), this is just stellar. No complaints from me.
i dont think odin will work, im chatting with a samsung worker now, ill post back with what they tell me
DO NOT PANIC if the update seems to be taking a while. It does take some time to update and it will stay on the Galaxy S logo for some time. Be patient and let the update process complete, and put it on the charger if you can. the stock units should all update more often than not.