NetSentry
“NetSentry is a network traffic alert system for the Android operating system. It keeps track of how much data is transferred over each network interface of your Android system. When certain usage levels are reached you will be notified over the notification facitlity.”
If you’re on a limited data plan, this one is the best network traffic monitoring application.

Locale
“Locale dynamically manages your phone settings based on conditions, such as Location and Time. Never worry about your ringer going off in the wrong place or at the wrong time again. You can set it and forget it!”
One of the best android applications at all.

SkyMap
“Google Sky Map turns your Android-powered mobile phone into a window on the night sky.”
By using the Android phone’s orientation sensors, a star map for your location is shown. Impressive.

Toddler Lock
“Graphics and sound to keep your toddler entertained without having to worry about them dialing a number or going in to other applications.”
Very essential if you’re surrounded by kids.

Call Faker
“Ever been in an uncomfortable situation or with someone who talks too much? Just set the contact, time, and ringtone, and the phone will ring with a fake call, allowing you to escape!”
Oh yes, works great and helps you to escape mother in law sunday afternoon talks. Somehow essential.

WifiAnalyzer
“Turns your android phone into a Wi-Fi analyzer!! Shows the Wi-Fi channels around you. Helps you to find a less crowded channel for your wireless router.”
Best Wifi analyzer. Use Menu|View to change graph and list view mode.

Ultimate Stopwatch & Timer
“Nice UI stopwatch with lap timer and countdown timer. Can run in background and you can save lap times to compare later. New Alarm Sound when Countdown complete, uses system volume.”
A very nice interface and it does it’s job very well.

SwiFTP Server
“SwiFTP is an open-source FTP server that allows you to connect to your phone over wifi to upload and download files. Any FTP client may be used.”
Nice and easy interface, transferred the data faster than any other Android FTP server application.

TV-Guide
“Fast and easy TV listings for Germany. Quickly get an overview of what’s on right now – the shows, the movies and the sports events.”
This version is for German Television – it works nice and gives you a quick overview. Swedish and UK version also available.

Layar – Reality Browser
“The Layar Reality Browser displays real time digital information on top of reality in the camera screen of the mobile phone.”
Depends heavily on your location – you won’t find any additional informations right out in the sticks. Use it while you’re in the city.

aTrackDog
“aTrackDog finds the newest version for all apps even they are not listed in Market.”
Gives you a nice overview about installed applications and updated versions.

GPS Status
“Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites. Check your position, GPS accuracy, speed, acceleration and bearing. A magnetic compass is included which displays both magnetic and true north. Use it as a leveling tool or detect magnetic anomalies in your area.”
The one with the best interface.

aCurrency
“A currency converter for 160+ currencies with daily exchange rates update.”
Always up to date. Nice.

klickTel
“Funktionen:  Telefonbuch, Branchenbuch, Rückwärtssuche und Lokale Suche in einem  Geldautomaten: Suche nach Bankautomaten aller Banken.Kaffee und Burger: Überall Starbucks und McDonald’s finden. Nie wieder im Stau stehen: Anzeige aktueller Verkehrsinfos und Baustellen”
German only. Sehr kompakt für alle oben genannten Informationen.

Android Application Browser (Website)
“Now you can keep up with new Android apps from the comfort of your desk!”

What are your favorite Android applications?