Thanks both of you
I have Windows Vista 64 bits with 8 gigs ram
And Lightroom2 has 64 bits version That the first reason for me to get a try
I have used demo today
The library side is very good so far
The local brush in Developpe feature works slow but give good results on some photos
Th print feature have given me better results than Photoshop Cs3 (i dont know why)
I will continue to try it  (299$ are 299$ so......)