I like #21 - the script signature is very nice! Would like to punch up the idea of fun (in the workplace), maybe include a tagline "Fun: Your Competitive Advantage" or use another graphic to convey fun? Nice work - thanks!
#38 is a very cool idea! A couple of thoughts to help refine. The font for my name - not the right one, but close. Maybe play with the sans serif fonts too? Also, green needs to be a little grassier green, something close to my other website (and book cover) at www.CoachClemens.com. Finally, a minor point - the baseball as the head of the microphone was much better in black on #34 (#8 looks more like a tennis ball). Very nice work!!!