Open question on sites

Hi

I am seeking open comment on the following:

Site SEO:
Should I use one single site and put all my effort into that one site, making all pages quality etc etc, or use a single moderate site and put some efford into having many satellite sites orbiting? Sites such as keyword and microsites, which all link in?

Micro / Keyword Sites:
Any recommendations, please, on software which can take a list of keywords and produce multiple templates / site pages based on that list of keywords?

I would like to be able to have 40/50 sites with each site linked to a particular set of keywords or keyphrases. If I was to make a small tweak to the master template, I would like all the sites to update immediately - dynamically.

I have played with XSitePro, but it only seems to be good for the creation of mutliple static sites.

Many thanks

Well,i guess it should be.Always give your best in every business.From the site itself,keywords and marketing ways everything should be perfect as possible.

go with the more sites ..links are better that content nowdays