I have no 'quick solution', as I do believe any transition from co-sleeping will take some time (after all, it's not fair to just suddenly change the rules on baby!). However, I have found this article quite interesting and useful - http://drjaygordon.com/attachment/sleeppattern.html
That being said, we have co-slept with Zoey from birth (she is now 13 months old), and we don't really have a plan to change anything - we'll continue for as long as it works for us. Part of it is that we enjoy our little alarm clock :) but mostly because it's a way for us to enjoy time together since I've gone back to work and she is in daycare all day. We have used some of the techniques - my husband goes to soothe her when she wakes after 11pm, and she does settle with him within a few minutes.
Also, there's a personal story about a gentle transition from family bed
to own room at http://drjaygordon.com/attachment/gentletranstition.html
BTW If there are any AP parents out there, this site has a lot of great information, tips, ideas, etc in the "Topics" section.