jflamm,
since this is a bit off-topic, i might split this question into a new thread depending on how in-depth the discussion gets.
i'm using 2008 enterprise edition 32-bit (hence the 2008 EE x86 abbreviation above). 32-bit server 2008 has been tested to run faster on average than 64-bit, plus it's more compatible with applications
and supports up to 32GB system memory.
battery life is about 5 hours on the 3-cell main + 3-cell bay battery during normal use with wifi turned on, a few light apps open (browser, ms office, etc.), and the display at 3-4 clicks from maximum. i've never used XP on the X300 to know how it compares.
cold boot time is about one minute to reach a working desktop. server boots slower because it starts/loads services with heavier rights/permissions checks. shutdown only takes about 6 seconds on average after some tweaks.
all of the thinkvantage apps/utilities work just like they would under vista. 2008 and vista + SP1 share the same kernel so the apps usually can't tell the difference. driver installers can be a pain but i found that thinkvantage system update
is compatible with 2008 enterprise 32-bit. i had to manually install drivers for bluetooth and WUSB but all of the radio indicators work as advertised along with all of the on-screen indicators.
the pro of 2008 is that it's rock-solid. i haven't had any major issues with it and it runs extremely fast. every once in a while i'll get a minor failure of something like acrobat's tray app, the display driver, or something insignificant. it's mostly because these aren't made to work in a server environment. one pro of 32-bit is that it takes up about 4GB less driver space than 64-bit.
the negatives are that there are still some apps/drivers which won't install under 2008 no matter what you do. sleep is an issue and on a fresh boot it will immediately wake back up from going into standby because a server isn't meant to sleep. the second time you invoke sleep it will finally stay in standby mode. hibernation, the one time i tried it, caused a major crash. these are major nuisances, especially when traveling.
i made quite a few comments about 2008 on my X300 in this thread:
http://forum.thinkpads.com/viewtopic.php?t=59154
hope that helps answer some of your questions.
