There are a number of the "Exchange Insider" articles starting to trickle out onto the TechCenter web site: http://www.microsoft.com/technet/prodtechnol/exchange/2003/insider/default.mspx. In case you are not familiar with these articles, they come from a weekly "tech bulletin" that is sent out. Over the years these weekly emails have hosted various guest writers on many interesting Exchange (and Exchange Related) topics.
I have also written a few in regard to OAB (Offline Address List Generation).
Offline Address List Generation Overview - http://www.microsoft.com/technet/prodtechnol/exchange/2003/insider/offlineadd.mspx
OAB Version 4 in Exchange Server 2003 Service Pack 2 - http://www.microsoft.com/technet/prodtechnol/exchange/2003/insider/oab4.mspx
I hope that you'll find them as useful as we do internally!!