Just a word of warning here.
If you are making good money using Adsense than get more than 1 account and spread your domains across more than the one account.
I recently had an adsense account deleted for apparently fraudulent clicks.
This was in no way related to me but the sites were designed in such a way that I was getting an extremely high CTR.
Anyway - that was lost income and a lesson in always being prepared.
I am in the process of getting my 4th Adsense account at the moment - the others are all OK but you can never be too sure and all accounts will now use Robert Planks script which is for free at adsenseshield.com
Also - I have heard of people getting their second accounts banned when trying to use the same domains on another adsense account.
I have changed the banned sites to affiliate income.
Hope this might save some people from having a big drop in income.