Ed - Glad you're finding Zerene Stacker to be useful. Thanks for the link to LordV's macro website - it contains some really jaw-dropping images with excellent colour and detail.
Brian - I noticed you'd mentioned Zerene in your Flicker "Focus Stacking Tutorial". Thanks for the comments. I've found that the Zerene Retouching function is really quite useful in dealing with halos, see:
Zerene Stacker Retouching
Adam - You have done a fantastic job with that stack - well done!!! I strongly recommend everyone check it out Adam's image at the higher resolution (click image a second time).
I'd be interested to know how you set up for this stack. Did you use a tripod for example?
Bruce