[Captivate Q&A, Help & Troubleshooting] geokhentix:
Oh man. I'll see if I can answer them all. LET'S DO THIS!

1. Before you left 2.1 stock, shoulda backed up nv_data. If your Device ID and produce code get messed up, check out http://xdaforums.com/showthread.php?t=881162 and http://xdaforums.com/showthread.php?t=880223 Use these threads to try and restore it; but if that doesn't work you might be SOL without a nv_data backup.

As for exhange, check out http://xdaforums.com/showthread.php?t=821297

I work for AT&T, so me and IMEI's are best buds. You can't change your IMEI as it's a number issued directly for AT&T. AT&T uses these IMEI's to determine what type of phone is on your account. Should you change the IMEI, it would appear to AT&T as "Unknown GSM", and you would cease to get data.

2. Read #1

3. It depends on the apps you use to accomplish said tasks. I would imagine very few of us use the stock e-mail client, i would imagine most of us use K-9 or something along those lines, in which case you can specify a sound file in said apps settings.

As for having them show up in the default menu, throw them into /system/media/audio/ringtones and they should show up in default.

I'm not sure about the reminder, although I can't see an app for this not existing. As stated above, some e-mail clients such as k-9 or SMS like handcent may have this feature. If the stock ones don't, what can ya do?

4. Don't get either, get Root Explorer.

5. If you already have a clock, I suppose all Daily Briefing offers is news and a calendar. There's plenty of awesome news readers for the Captivate. If you like the widget variant, i would go with Feedr. If you prefer non-widget news readers, Google Reader, gReader, NewsRob; all good choices.

6. It depends on the ROM. USB Tethering can be accomplished through apps like EasyTether or PDANet, but most ROM's for the captivate do have it standard. It would be under Menu > Settings > Applications > USB Settings > PC Internet.

7. Latitude is bundled in with Google Maps. Not sure how to remove it, or if you can..maybe.

8. You don't need it. It's just a global way to share pictures and videos to multiple sources. I never use it.

9. Connect to WiFi!

10. Aside from decompiling the APK, i don't think so. Maybe NinjaMorph can do it, but I don't think so. You can hide apps from the drawer though, or hide the text, with alternative launchers.

11. The captivate stock firmwares seemed to have a problem with randomly rebooting. I work at AT&T and I sell these phones daily so I can safely say it's just the stock, even the 2.2 stock seems to do it. You can use SetCPU profiles to work some magic, but it's easier to just install a Custom ROM, as I personally no longer have this problem UNLESS i am on stock. Use http://romkitchen.org from your phone, easiest way. Make sure to donate if you use it frequently, it's an awesome service!

12. Can't answer this one. I imagine there's an app to back up texts to files on the phone directly though, if not it wouldn't be very hard to make!

13. From your contacts on the phone, menu > (possibly More) > Import/Export. It will save EVERYTHING about your contacts(Ringtone info, pictures, birthdays, etc) to a .vcf file. These can be altered, edited and saved on the computer.

14. 2.2 stock needs a fix I'm pretty sure. Check out this thread http://xdaforums.com/showthread.php?t=881941 , all you gotta do is flash one file, so do it anyway just to be safe!

Phew. Hope this helps!