Someone e-mailed tell_fs over the weekend asking if the G1000 in Flight Simulator (deluxe edition) had a bug: they couldn't get glideslope information. It is indeed possible to get glideslope information using the G1000.  Do make sure that "LOC1" is visible on the HSI if NAV1 is tuned to the ILS or "LOC2" if NAV2 is the one tuned to the ILS (cycle through the availabe options using the "CDI" softkey button at the bottom of the PFD. 

Glideslope is represented by a green diamond on top of a background of 4 dots just to the left of the altitude display on the PFD.