Callsign DB – Looks up call signs
EchoLink – Let’s you connect to Echo Link on your Droid
ElectroDroid– Very similar to Electronics Assistant only for your Droid
Ham – Call sign lookup and Solar Conditions
HFBeacon – Informs user which HF Propagation beacon is transmitting at the present time
IRLP Finder – Locate the nearest IRLP node to near your location
Scanner Radio – Listen to online radios, including ham repeaters using your Droid.
Some I haven’t tried:
Signals – Reference for 10 signals, Q-Signals, Morse Code, etc.
Ham Radio Study Guide – Amateur Radio Question Pool
HamSatDroid – Amateur Radio satellite pass prediction
Amateur Radio Call Log – Basic Ham Radio Call Log
EchoLink Finder – Find the nearest EchoLink Node
QTH Locator – Calculates and displays your current QTH Locator
Morse Trainer Light – Learn or improve morse code
Grid Locator – Locate Maidenhead Grid Location
NCDXF Beacon – Monitor NCDXF beacons
PalmVE – Take sample Amateur Radio exams and locate VE testing sessions
QSL Mobile Ham Radio – Functions include GeoLocation, Call Sign searches, etc.
HamLog – another logging program
DX Cluster – Live DX spots on your Droid
AE Morse Code Tutor – Learn Morse Code
QTH Locator – Displays current QTH using google maps
APRSdroid – Allows reporting of your position to APRS-IS networks
There are more available, just do a search for Ham Radio in the Android Market and you can download most of these for free.