If you want some help with it i'll help you out just post the config files you currently have. If you want to switch plugins I haven't experienced...
If you want to dedicate 3G of RAM to the server I recommend using this in your run.bat: java -Xms3G -Xmx3G -jar craftbukkit.jar -o true PAUSE...
I agree you should be able to enter commands did you try typing near the bottom or was it just that your's was out of date.
I think timtower is trying to say that in the permissions you have a "permissions.\*" which you can't have the "\" in there.
Separate names with a comma.