Thought I would share my experience on the recent Blazer-Novarra browser changeover since I have gotten good information from this forum before.
When I first got that warning message around Sep 21st telling me that Blazer would not work anymore after Sep 22nd, I dutifully went and downloaded the Novarra NWeb browser onto my i500.
However, I could never get it to work so I was pleasantly surprised to find my Blazer browser still working after Sep 22nd. Not wanting to fix something that wasn't broken, I continued to use the Blazer browser for another month until I got another warning message last week reminding me that Blazer was supposed to stop working back on Sep 22nd. And this time, it really did stop working.
So, with no working browser, I resorted to calling Sprint and waited about 25 minutes on the phone for a Level 2 Tech who solved my problem in 4 minutes.
Apparently, even though I had loaded Novarra onto my i500 back in late September, there was some sort of Sprint system glitch that prevented the Novarra browser from auto-provisioning which it should have done. The Sprint Tech then walked me through a simple manual provisioning which got me up and running on Novarra in no time (note that the phone has to be turned off and on in the process so you can't be on your i500 talking to a Sprint Tech when you do this procedure).
Here's the procedure in a nutshell:
1) Tap on the Application Launcher
2) Then tap on the drop-down list at the upper right of the screen and select "System"
3) Then tap the "Preferences" icon (this assumes this was in your "System" folder)
4) Tap the drop-down list at the upper right and select "Phone Prefs"
5) Select the "Internet Settings" bar
6) Then select "Update Profile"
7) It will show an "IOTA Configuration" screen; tap "OK"

Then the phone will undergo an "Updating Vision Profile" provisioning process for 2-3 minutes
9) Tap on "Reset" to power the phone back on, and then try the browser
Good luck!