Robert_Charlton - 6:35 pm on Apr 29, 2006 (gmt 0)

I have so far not moved the site to a new domain because I am too worried about losing rank and being sandboxed etc - should I be?

Yes.

That said, if you have good reason to make the change, do so in a slow season, promote the site "naturally" after you do change it, and expect to be hurting for 6 months to a year, at least.