We have had to wait a month and a half since the release for the full Google Experience to start being available and working on the Archos 5 Internet Tablet with Android. Google had not certified the Archos on Android 1.5 for a WVGA 800×480 Google Experience, so the hope is that this certification will be signed by Google when Archos updates the installed Android version to 2.0 at some point in the next weeks.
For now, someone in the forum has posted instructions for how to install the full Google Experience on the Archos using the ADB developer debugging tools: http://forum.archosfans.com/viewtopic.php?f=47&t=27934, and JKK has posted a tutorial for how to install it on Windows: http://jkkmobile.blogspot.com/2009/11/archos-5-it-now-with-android-market-and.html