The TM has been added, name changed to upper/lower case and the slogan added. As far as people knowing the purpose of the product from seeing the logo, I think your product may be more complex than a (good) logo could represent. I'm afraid that a logo that shows more about your product would end up looking like a technical manual rather than a logo!
My design is very obviously representing beer in a pint glass. The black space at the top is intentional as it shows the LACK of foam in addition to the foam. I think this logo is strong enough to make people WANT to know what your product is all about!
Jason
(This comment references Entry
#33)