SEO, URI's and routing.... Best practices?

[eluser]tomcode[/eluser]
Using another page than the domaine name as home page is not a good idea, especially Your example (too many segments).

Having duplicate content neither (same page with several URL's).

You should structure Your controllers in a way that You get good URL's without routing.

Set Your site up in Google Webmaster Tools.

Read for example Google Webmaster Tools Help - SEO

Another site to read : The blog of portent.com