1. My understanding is that broken parts are generally replaced pretty easily by the user...people here have changed keyboards and I imagine the screen is pretty doable. You should go to Lenovo's website and check out the maintenance manuals. As for the processor...I had heard it is soldered on, so no upgrading it unless you have some serious electronics skills. Again, the manuals might have more details.
2. Probably 6-8 hours. It depends on what you're doing (intensive HD or CPU tasks), whether you're using the WiFi and Bluetooth, and how bright you like your screen. The more memory you stick in the machine, the less you'll need to go to the HD. I think a number of people have complained that 512MB isn't enough for this machine. I have 2GB, which let's me disable the swap file entirely.
3. I have a sleeve from here:
http://www.sfbags.com/products/sleeveca ... ecases.htm
I love it. You can turn it into more of a bag by adding a full cover, a strap, and a little piggy-back pouch that could hold your essentials.
4. Charging is slower than you would expect...probably close to parity or a little bit faster than the fastest you can discharge the battery. Someone in a previous post mentioned that batteries last longer if they're charged more slowly so that must account for the slowish charge times.
5. I thought someone said the new core 2 duos will ship sometime in November. Who knows when low voltage Core 2 will be available. The new Santa Rosa chipset is supposed to be released sometime in the 2nd quarter of 2007.
Misc:
If you go between two locations: get a second AC adapter so you don't have to carry it with you everywhere you go.
Choosing between the Atheros and the Intel card may be difficult. According to some, Atheros consumes more power but sees more APs and connects better. The Intel card uses less power but sees fewer APs and some people have had connection issues. There's debate over which card creates more heat on the right palm-rest area. I think the debate is leaning towards Atheros producing more heat but I doubt the debate is over.
Also, someone (Archer I believe) on the Forum selected the L2300 processor instead of the L2400 and claims that heat issues are much less noticeable with the L2300 vis a vis the L2400 and his company owns some of each.
Finally, I like having the 4-cell slimline battery in addition to the 8-cell. I use the 4-cell on a day to day basis because the machine is lighter and the form factor is smaller. I keep the 8-cell in storage for times when I'm travelling.