As a reseller, what are the "taxing" requirements we must consider?

I assume they are somewhat different by state... As a consultant located in Texas, I am used to charging 'basic' taxes for clients within the state - of course, the calculations can quickly become convoluted, as the appropriate rate depends upon the clients address and the city/county they are in - and any out-of-state sales are considered tax exempt.

I am to understand USF is somewhat different, and communications services tend to carry [significantly?] more taxing requirements than other services. Is there a condensed yet comprehensive guide to what taxes/fees resellers are required to collect and submit?

Thanks!