hi,
there is no hard limit on the description field, only the limit of how long it makes sense to be... nobody wants to read a novel just to buy a download...
we want less than 10 tags, perfect would be 4 with the products to avoid overstuffing... neither google, we nor the users like products with massive tags that just lead to more duplicate content pages because it is always the same product...
the character limit for the keyword input field is 96 (i think) in the edit page... including spaces...
ralf