If you're getting apps from other sources, not just from SlideME or the Android Market (who have their own market apps), then this app may be of help to you.

App Installer will scan your internal storage and/or SD card for apk files and show you a single unified list of all the apps you can install.
You'll get the following information :

• app name
• app icon
• app version
• apk size
• app package

You will also see the status for each app, as follows:

• green icon - the app is already installed, and the installed version is the same or newer than the apk version
• yellow icon - the app is already installed, but the installed version is older than the apk version
• red icon - the app is not installed at all
• warning icon - the app requires a minimum Android version higher than the one on your device

Note that after installing apps or uninstalling apps, a rescan is needed for the statuses to be refreshed.

Then, it will only take one touch of the finger to either install the app, or delete the apk file.

The app has an Update Notification feature.
If an update is available, the app will tell you about it and what it contains.

The app works on all devices (not just phones) running Android OS, with internet access via WiFi or your mobile carrier.

Permissions
INTERNET - required by the Update Notification feature and by Google AdMob
ACCESS_NETWORK_STATE - required by Google AdMob
WRITE_EXTERNAL_STORAGE - required for deleting the apk files from the internal storage and/or SD Card

ChangeLog
Click here to view the ChangeLog

Screenshots: