Backup contacts, photos, apps, remove google account, and replace with dummy account
Here is what I have done so far for each thing to backup (For reference I am on Droid 2 Global CDMA, OS 2.2:



Contacts:


Open "Contacts" i.e. "Contacts A-Z"
Click the menu  button
Click "More"
Import/Export
Selected "Export contacts to:" -> "SD Card"


The file will then be exported to "/sdcard/00001.vcf". Every time you export it will increment. The VCF file is one of the those standard types of files and is human readable, so even if you have problems later you can at least salvage the information. Just connected by phone to PC via USB and copied.



Photos:

I am not sure about third party apps or other versions of android, but it seems all of my photos are stored on the sd card using the dcim folder "/sdcard/dcim" which is easily accessible upon connecting with USB.



Calendar: 

It looks like it was using one of my account's Google Calendars, I don't know if they permit a local only option with the default calendar. I plan to just export using my private feed to the next account or dealing with this separately since its not "not on the phone" http://www.google.com/support/calendar/bin/answer.py?answer=37111



After backing up the above and some specific apps with dumps, I decided to just go the root route (z4root) and I am now using adb to backup files (http://jonwestfall.com/2009/08/backup-restore-android-apps-using-adb/), I might also try Titanium or make a image once I figure that part out.



I will update others as I go.