Jochen Weiland and Riona Kuthe of JWeiland.net in Germany gave a very good presentation on some TYPO3 best practices last year in Berlin at the TYPO3 conference.
I found the related presentation workshop PDF again today and looked a bit deeper into than before. There's lots of good advice contained therein regarding hosting recommendations, modularizing TypoScript code and helping pick which templating method is right for you.