Upload files to:
~/installers/
With the following naming syntax:
Etoys-{majorVer}.{minorVer}.{buildNum}-[Alpha|Beta|Final]{2-99}-[Win|Mac|XO|ToGo|Linux].[exe|dmg|deb|rpm|zip]
Examples:
Etoys-4.0.2247-Beta-Mac.dmg
Etoys-4.0.2247-Alpha2-Win.exe
Etoys-4.0.2237-Final-Linux.rpm
Etoys-4.0.2237-Beta-Linux.deb
Etoys-4.0.2237-Beta2-ToGo.zip
The download page is smart enough to take the latest "finals" (determined by build number) and put them in the top spots.
Below that it'll list the most recent beta, then most recent alphas.
Be careful with file timestamps, since the page uses those for file dates. You can use "touch -t 200901311200" ([[CC]YY]MMDDhhmm[.SS]) to put a date back to its earlier date.