Exciting news yesterday that the Google Apps Marketplace was launching – this morning I thought I’d give it a whirl but…
To quote Homer Simpson… Doh!
Ben Kepes
Principal of Diversity Analysis, Ben is an analyst, entrepreneur, commentator and business advisor. Areas of interest extend to enterprise software, software integration, financial/accounting software, platforms and infrastructure as well as articulating technology simply for everyday users. 
I just now used the link you posed yesterday and it worked for me. http://www.google.com/enterprise/marketplace/home unless you wanted something else.
Not only this… I was browsing the marketplace yesterday and simply going from page 1 to page 2 on a category I got this:
“Your computer or network may be sending automated queries.”
Stupid. http://twitter.com/freitasm/status/10253787275