2.50 text builds

Hello world (of Blender:D)…
In my first post here I`d like to ask…

how to use the EXPERIMENTAL builds

As I dont like the previous interface, I hoped much about 2.50 and decided to mess a bit with it. I got its 3 builds from graphicall ("optimized" tbl, WinXP). However, what I got was 2.49 and even 2.48 while the 3rd one didnt work at all. Haven`t found anythng here (and elsewhere, either) on this topic, so maybe someone can help how to get the current state of 2.50 and make it work to any degree?

Thx in advance…

Blender Trunk SVN 22007
blender-SVN-20375-py25
…and some not working s*&^…