Root !if you deleted an important system app,look here!

[t3084]

Rebot into recovery.
Mount the system partition using the recovery GUI or through either of these commands

adb mount -t yaffs /dev/block/mtdblock5 /system #mounts only system
adb mount -a #mounts all partitions in /etc/fstab of the recovery

Push the apk to your system app folder

windows

adb push C:\path\to\local\apk.apk /system/app/

*nix

adb push /path/to/local/apk.apk /system/app/

 

[AndyOpie150]

If your using a ClockWorkMod recovery you can transfer files, folders, apk's, etc, from the PC to any system file/folder, or back. Delete or add anything you desire with a straight drag and drop using QtADB. This is an older utility that has been greatly improved by nijel.
It will also flash a recovery, boot into fastboot, and more. I have added it to the All Things Root Guide sticky.

If any member thinks something needs to be in the ATR Guide sticky, PM me with a link to the developers site that has the direct download link. Please, no direct download link's, just links to the dev site or page on a community forum.