The Droid is my first Android phone and I'm loving it so far. Unfortunately, Android doesn't have nearly the number of apps that other smartphone does. So if you know of an app that exists for another phone and not on Android, contact the developers and ask for one.
For example, I contacted TripIt to ask them to make an Android app. If enough people start asking for Android apps--rather than just sitting around and waiting for them to appear--companies and developers will get the message and the Market will really get booming. From one thread I see a number of people have been contacting Audible.com... good job!
The moral of the story is if you don't see an app you want, ask for it!