Microsoft released Trial version of Windows 7 Enterprise edition. You can download the Windows and run it for 90 days. It is the RTM version, if you want to try go and download it.
http://technet.microsoft.com/evalcenter/cc442495.aspx?ITPID=sprblog

Nice, but the RC should last me until I get the full version (besides, it's good until march or so).

If anyone doesn't fancy being a statistic or filling out forms or using silly Java download managers, here's a direct link for the 64-bit version:
http://wb.dlservice.microsoft.com/dl/download/release/Win7/3/b/a/3bac7d87-8ad2-4b7a-87b3-def36aee35fa/7600.16385.090713-1255_x64fre_enterprise_en-us_EVAL_Eval_Enterprise-GRMCENXEVAL_EN_DVD.iso
I haven't got the 32-bit link unfortunately, but 64-bit is suitable for most systems now.
And if you know how, this version is very easy to make yours forever...

http://wb.dlservice.microsoft.com/dl/download/release/Win7/3/b/a/3bac7d87-8ad2-4b7a-87b3-def36aee35fa/7600.16385.090713-1255_x86fre_enterprise_en-us_EVAL_Eval_Enterprise-GRMCENEVAL_EN_DVD.iso
Ok here's the 32-bit version.

i'm still in a sulk because they started the upgrade offer 8 days after i bought vista. :-(