http://www.talkmicro.com/viewtopic.p...r=asc&start=15
This might be the thread you're talking about? Not sure.
Dude, I'd just submit as much of a variety as you can. I think that's all they're looking for.
Show us which images you've been submitting, and maybe we can comment on them? Hey - you never know, maybe one of us can give you some feedback / constructive criticism.
Here is a link to your portfolio on iStock - I've got to say, you have some very professional looking shots. There's no doubt in my mind that you should be accepted on StockXpert...maybe you're just submitting the wrong ones? Maybe it's their fault, I don't know.
These are the one's I'd submit, if I were you (if you haven't tried these already):
I think that shows a good variety, and what you're capable of as a photographer. If they still don't want to accept you - don't get discouraged, just keep on shooting! They will, eventually.