actually, there's another way to install this as well lol
just download the zip. unzip it, then go to system > app and copy the apk over to your sd card and now you have an installable apk file. don't even have to use Astro or anything.
it's worth noting, though, that this is only the original modified to work on our device. double tap for the ., key doesn't work and there's some error where if you type something in like "i'm @ Jenny's house" then it actually comes out like "i'm@ Jenny's house". for whatever reason, symbols stick to the last letter before it. so, i'll be waiting for the Droid X to get FroYo and then for someone to dump their updated keyboard.