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OK, this is pretty impressive. Almost all of the 26 Firefox extensions I have installed at home are already ready for 2.0. 

Only seven extensions I currently have installed are not ready.  Of these two are just frills (Shazou and Timetracker).  Spelling is built in, so I won't need Spellbound.

Of the other four that are not yet ready, there is one which I'll certainly miss but can manage without (Autofill). There is really only one showstopper -- TabMix Plus. And the developer of that says he needs a week or so to get it ready.  So it looks like I will only have to wait a week or so to upgrade to 2.0.

Here's the list of what I use with info on upgrade status drawn from the amazing Bill's Big List of Firefox® 2.0 Compatible Extensions

Ready for 2.0

Adblock Plus
Chatzilla
CoLT
del.icio.us Complete 1.3
Download Statusbar 0.9.4
dragdropupload 1.5.21
EditCSS 0.3.6
ErrorZilla Mod 0.1.1
Extended Statusbar 1.2.5
FireFTP 0.94.4
Gmail Space 0.5.1
Googlepedia 0.4.1
gTranslate 0.3
MR Tech Local Install 5.3.1.1
ScrapBook 1.2.0.6
Searchbar Autosizer 1.1.2
Video Downloader 2.0
View Source Chart 2.4.05
X-Ray 0.8.1

Not (officially) ready for 2.0

1. Autofill
2. Bugmenot 
3. Shazou
4. The functionality of Spellbound is, I gather, built in to 2.0
5. TabmixPlus is not ready yet, but should be ready Real Soon Now 

   I REALIZE THAT FIREFOX 2 IS GOING TO BE RELEASE ON TUESDAY, OCTOBER 24. A NEW VERSION OF TAB MIX PLUS IS GOING TO BE RELEASE SHORTLY AFTER THAT, IN LESS THAN A WEEK. PLEASE BE PATIENT, FOR NOW YOU CAN TRY THIS VERSION EARLY.
   http://tmp.garyr.net/forum/viewtopic.php?t=3515

6. Timetracker
7. Wayback (but this is somewhat obsoleted by ErrorZilla)