I ride a motorcycle, and love the speedometer apps... I've downloaded GPS Speedo, Speedview, ZP Dashboard and Speedometer. For that 'WOW' factor you're going for I like ZP Dashboard, it shows your pitch and roll like and airplane, and has a compass at the bottom of it, looks really cool. For actual usablility both GPS Speedo and Speedview are really useful, both record your max MPH, and GPS Speedo records your average MPH as well. 'Speedometer' has so much info I haven't even messed with it yet, but if you ever did track days, I would think that app would be VERY useful!
So the trick is to find a certain thing this phone does that is cool in your eyes. Maybe not everyone likes the speedometer apps, but I dig them a lot. It was really funny because we rode the the GP race a couple of weeks ago and one of my friends commented on how fast I was going. I told him, "I was only doing 5 MPH over the speed limit". He says, "my speedo said we were doing 90"! So I slapped my phone onto his bike (I have the universal mount) and we took off down the road. Pretty soon he realized that 90 on his speedo was actually only 75 MPH on a GPS calibrated unit. He was ubber impressed with that app. He has a Windows Mobile phone, he said he's switching over to an Android as soon as he can now!
Play around in the market long enough and you'll stumble across something that grabs your attention sooner or later. And don't let yourself get jaded by todays gadgets. I keep telling myself that back when I was in highschool the thought of holding a computer on the palm of your hand that could do the things this phone can do was nowhere on the radar. If you would have told someone you had a dream about a device that could do the things the Droid X (and other phones) can do back then, they probably would have set you up at the looney ward in your local hospital to keep survailance on your for 72 hours to make sure you weren't about to go off the deep end and climb up into a clock tower somewhere with a sniper riffle.
These things are completely insane, and those who get bored with them so easily... well I feel sorry for them. How could someone who takes for granted the incredible times we are living in ever find something to satisfy his craving for something to 'WOW' them? Uh oh, I think I might be getting old... that really sounded like something my grandfather might have told me when I was a boy! :O