That's the trick
"Except a decent version of Go, for that you'll have to go to Vieka and download manually."
Which is kinda the point isn't it? That you *can* go to a software vendor's website and download whatever software you like, outside of the Marketplace.
Microsoft have provided a nice convenient alternative to downloading from the 'net, and I'm sure it'll expand over time, but as far as I'm concerned it's just another way of obtaining Winmo software among many (e.g. handango etc.)
Long may the freedom of distribution method remain in the hands of the developers!