I read that as well, both in Men's Health recently, and a while back in Muscle Media. Supposedly, the creatine is still shuttled into your muscle cells, and it's muscle-building effects are not hindered by caffiene. Where caffiene MAY interfer with creatine's effects, is for recovery from short burst sprints. Apparently caffiene delays or lengthens your 'relaxation time' between maximal output.
What I did at the time was cut out all caffiene for 4 weeks. I didn't notice any difference in creatine's effects (my interval sprints slowly progressed at about the same rate as before), but I did find it a lot harder to get going on my 5:30 A.M. workouts.
At the end of those 4 weeks, it was time for me to start a
cutting cycle anyway, so I started with the ECA stack twice a day. Again, I noticed no decrease in creatine's effects (sprints continued to improve, and recovery time did not suffer), but I AM a lot more 'into' my
morning workout when the ECA kicks in.