google sandbox terms

Hi there, does google use its own keyword sandbox terms when ranking a
website and attributing relevance to a topic? i ask because its what
inspirals (my main rival) appears to be doing.

ive also noticed a trend in ecommerce from putting product in front of
people to having text introducing product sections. i assume this is to
increase keyword density?

Anyone got a primer for such a solution?

Mark
www.iosilver.co.uk