Google san box is scary for webmaster, especially for seo markteing. because it will decrease traffic to the site. How about google sandbox get your domain? here is about google sandbox that quotes from wikipedia:

The Sandbox (a.k.a. Sandboxing or the sandbox effect or the Google penalty) is a name given to an observation about the way Google ranks web pages in its index. It is the subject of much debate—its existence has been written about but not confirmed and several observers state that they have observed the contrary.