For low light pictures without flash, which cameras is better in these categories:
1- Compact (I know Fuji's F series ans E900 are good ...)
2- Entry level SLR
3- SLR
4- Your overall choice
The all time champ, currently is the Fuji F-30, in the point and shoot category. The KM 5D and 7D, the Canon 30D, and Pentax DS/DL/K100D are all good highISO SLR cameras.