I found this quesiton posted on a discussion group for people who are super-serious about coffee. 

—–
Discussions > Espresso > Latte Art > Too much crema?
Posted by: Steve
I roast my own beans and usually use them up before they are a week old.  I have a terrible time getting the microfoam to break through the crema, usually just gurgles and bubbles underneath.  Is it a function of too much crema or not stretching the milk enough (or something else)?  I am usually stretching until I feel the pitcher just starting to get warm then bury the tip.  I have tried stretching a little longer and that seems to be too long-get the dry foam on top.
—–

People posting to this site create profiles for themselves that include their pertinent personal details.  You know, just like MySpace, right?

Here are Steve’s Stats:
Espresso: Pasquini Livia 90S
Grinder: Mazzer SJ
Drip: Clarity
Roaster: Stir crazy/convec oven

He sounds dreamy!  Totally my type.  (And is it just me, or was his crema post a bit suggestive?)

If you’re interested in reading more of this shit (it’s seriously fascinating, and I’m not being sarcastic), visit CoffeeGeek.com and check out the forums.