Right now in the market you have to manually update each app, is there an app that automates this?
Users can update several apps at once using Android version 2.2. An answer in the Android support forum says:
They have added this already but this is probably limited to market client app on Android 2.2 aka FroYo and higher firmware.
Also, I don't see anything in the market would bring this out for pre-2.2 phones, but it could be out there.
I use AppBrain it automates the install procedure a bit.
If you're after apps that automatically update themselves when an update is available, as of Android 2.2 there is an option to mark an app to automatically update. Then you'll never be bothered by an update alert for that app again (unless the security profile changes).
On 2.2 (all I have access to) use the Marketplace app, open the menu, select My Apps. All your installed apps will be shown, any with available updates will be shown at the top.
I don't see a way to then Actually update all that have available updates though. And apparently on older versions this feature is not available as a part of the marketplace.