Tip for the day: always search the forum first before asking. Chances are your question has been asked and answered before.

In your case, there are at least TWO threads on that very topic. Both of them are very fresh and stand out in Active Topics in the right hand panel:

• Nokia store to go down for n900 n9 ! What woud be effected (repo infra etc )? NOW OFFLINE 12\3\15(huge archieve.org backup inside ;D-
• ovi store apps mirrors information sdk downloads and other related n900 n9 stuff here.