Holger Irmler has released the first version of UpdateCheck. This plugin facilitates an automated check whether an update for other plugins is available. To be able to do so, the other plugins have to be equipped with a file version.nfo.
As only a few of my latest plugins already include such a file, I have published version info files for all my other plugins. If you're already testing hi_updatecheck, just go to the respective plugin page and download the ...-VERSIONINFO.zip file, unzip it, and upload the file version.nfo to the main folder of the plugin (right besides README, index.php, admin.php etc.)
Over time I will integrate the version.nfo files into new plugin releases. So, if there is no separate download of ...-VERSIONINFO.zip on the plugin page, the file is already integrated in the latest plugin version. In this case just download the latest version and update as usual.