placement of keywords in domain for seo?

[Abbadox]

I have a few questions about picking domain names:

1. If you want to target a keyword phrase in your domain name such as: thisismykeyword.??? and the dot com name is already taken is there a ranking of importance for the dot com vs dot net, dot info, dot org, dot etc... I am asking in terms of helping for ranking purposes.

2. From a search engine perspective if a keyword phrase is entered like: this is my favorite keyword and a website is made using the same phrase: thisismyfavoritekeyword.com would you get the same results in terms of a boosting your site if you had the phrase myfavoritekewordisthis, in others if you use the same words buy in another order for the domain name do you get an equal boost for having the keyword phrase in the domain?.

3. What works best for scanning domain names like this: keywordphrase.com as opposed to just searching by keyword phrase, I would like to generate a list of domains that people type in the browser instead of going to a search engine.

Thanks for any help guys,

Abbadox