I made a typo when I changed a .zip to .hpi causing hudson to reject the plugin
as invlaid. While it would be great if we could enter a URL, get notifications
of updates, etc (including for Hudson updates). For now it would be nice if
Hudson could do some smarter checking then just file extension which is what I
suspect it does now. As a hpi file is just a zip file it should be able to
check if the file is a zipped file and possibly even that it follows some
standard layout/has expected core files.