more variations to follow (btw, I'm thinking that a certain practical understatedness helps to reinforce the concept of usefulness - what do you think?).
In this design the jet-stream underscores the word 'Useful' while it carries the eye naturally along from left to right. Italicized text is suggestive of forward momentum/progress as is the jet-stream and is a nice tie-in with the rocket motif. The rocket itself is understated so as not to draw too much attention away from the central concept. The tagline placement makes for a nice finish, underscoring the concept plainly and simply. The form-factor is also very well suited to web page headers and printed assets. Overall, this design is cleaner, simpler, and more focused than my earlier submissions. I hope you agree.
For 12, 13, and 17 could you try a darker green? Also maybe the underscore of Useful have it a little more mountain range outline and improving graph-like. (Does that make sense?) I also would not mind seeing an example with a wider color band that might allow for the full tagline. Not sure if that will be too busy or not, but I would like to see what it looks like.