Installed 2.6.12-1.1447_FC4.stk16, and have had no change at all. As per a suggestion from another thread regarding my SiS900 ethernet controller, I have to boot with the kernel option acpi=ht in order for me to have LAN access and as with the previous kernel, with this option enabled, the battery meter doesnt work at all. Without the option, it will happily detect if I'm running off AC or battery, but won't give any indication on charge.
FYI, for me its more of a convenience than a nesessity to have a rough charge reading. I barely ever use the system for long with the AC plugged in anyway - pretty much only as I move to a different room.