well there are some places on the wiki that may be of more help.
forums.digium.com is strictly for asterisk. by all means ask for help in here; but im not sure that many people would be of help. i bought an FXO card but havent gotten it yet. once i get it, i will check back in here to try to help you out. i did dig around the AMP a little bit and it seems very interesting. i have yet to decide if i am going to go total VOIP or use a couple analog phones too. It seems like VOIP may be easier to set up; but they are more expensive too and i already have an analog phone set. so idk....but, anyway...i would still check out the asterisk forums if you havent already. i dont believe there is much of a difference in configuring it. also...my setup wont be using isdn so i dont know that i would be much help. maybe after messing around with it some i can help you figure some things out. i know a few people on here have posted some things about their setups.