There is a readme file in the firmware download that contains a list of the changes located here:

http://www.pentairpool.com/techinfo/downloads_firmware.htm

Here is a link that might be useful: Pentair Firmware

Thanks!

Here are the changes in v2.0x

EASYTOUCH 2.0 FIRMWARE (Not compatible with EasyTouch 1.060 and prior systems):

vers 2.010 5/5/08 New Processor Upgrade, requires version 2.010 and higher. Can not be applied to older EasyTouch systems.
Added Intellibrite support.

vers 2.017 8/26/08 UOC Only. Fixes schedule glitch (cannot enter a schedule under certain circumstances).

Vers 2.040 11/5/08 Fixed error when CIRCUIT NAMES OFF - when assigning IS4 and QuickTouch4 configurations garbage characters would be displayed.
Added several new features:
Heat/Cool support for ThermalFlo heat pump
Priming control for IntelliFlo VS pumps
Support for 2VS or 2VF IntelliFlo pumps (or one of each)
Added 4 digit Lock out for Indoor control panel and Wireless remotes
Added 8 feature circuits
Added iS10 spa-side remote capability

vers 2.060 2/24/09 Added Magic Stream laminar controls under lights menu. Sub Menu Has Toggle Thumper, Hold, Reset, and Mode
Selects - driving the Magic Stream Selected Relays. Also added Magic Streams as a Circuit Type.
Fixed problem with schedules not saving on UOC or schedules not being able to be entered.
Added IS10/IS4 Functions of Pump Increase / Decrease, to Step Up / Down IntelliFlo Motor Speed.
Added a Menu under Settings to control pump selection and speed step size (in RPM or GPM) per said IS4/IS10 controls.
Previous Definitions of 4SPEED Pump have been removed, IS4/IS10 Controls taking their place.
Fixed issue with program restarts - failed to fire if the current hour was the same as start hour.
Added Power up Restore function (so will power back up in Service mode with circuits on - if that is how it powered down)
Fixed Misalignment of Button - LED, on indoor and wireless for Master Cleaner operation.
Fixed ommission of IntelliFlo Priming Menu for V.S. Mode.
Removed 'No Comm' and no-Spa modes from IntelliChlor.
Fixed bug that caused random speeds to fire at random intervals in Freeze.
Fixed reported problem of special assigned speeds in Intelliflo (like HEATER) not ramping to the correct speed - this was true for HEATER, POOL_HEATER, FREEZE, etc.
The Feature circuits failed to turn OFF after being turned on either manually or by program.
Added support for Valves attached to feature circuits in Freeze.
Added support for Pump/Valve delay in Freeze mode. Now if Valve delay is selected, it will operate in Freeze also.
This is true for standard pumps as well as VS and VF IntelliFlo units.
Fixed problem where ThermalFlo Menus on Indoor / Wireless would not come up.
Fixed problem where Solar Preferred was not taking precedence when used.
Fixed problem where the Delay indicator "DEL" was not showing on the Indoor ICP or Wirelss remote.
Fixed problem with 'Light' Configuration, now appears as a configurable option in Lights Menu (so all on/off works on it)

I just got my firmware upgraded to 2.06 and it definitely seems to be more stable than 2.05. I was having a lot of problems saving schedules in 2.05. They work fine now.