I looked at one time. I don't think there is, since the iPhone doesn't have the capability to read the same stuff as a Mac for a battery (my theory, at least). So, there's no way to get cycles.
Battery aid isn't what I was looking for. Thank you for sharing as I didn't know it existed. I was hoping there was an app that tracks cycles and remaining life left. I think I'm going to replace my battery on 3G. eBay sells them for $12 for a 1600 mAh high capacity battery.
If you do replace the battery, let me know how it works. I was told it's not difficult, and I'd love a higher capacity battery. I was looking at them the other day, I think the site was ipodbattery.com or something.