Probably doesn't really matter in terms of SEO. But if you want to be in full control of your site, you're best to put it on your own hosting,...
Wordpress is way better. Blogger is so old school!
I found Wordpress pretty sweet. Drupal is good too if you want more pages on your site.
I like WooThemes too.
Tweetdeck is also good.
Check out Audio Hijack Pro from Rogue Amoeba.
I just like to use Twitter to post a nice stream of highlights from my site throughout the day, so the people who aren't active on the site can...
Interviews with people in your niche is good.
Do interviews with established players in your niche. Sponsor any podcasts/shows in your niche. Start your own podcast about your niche.
Check out WP Engine (search Google for it). Does all the hard work for you. I wouldn't host a Wordpress blog any other way.
I installed vBSEO and put the analytics code in there, so it knows where to best place it.
About goddamn time. Users shouldn't have to go to the App Store just to browse the forums properly on their iPhone.
Separate names with a comma.