While you're connecting these sites, you can also set them to share only to certain groups of friends, which is worth doing if you don't want buzzes about your public tweets, photos, and so on to be indexed by Google as part of your Buzz account.

Keep in mind that if you're an avid user of Google Reader, all of your Shared Items will also be posted as buzzes. This means that anyone following you through Buzz and Reader (which is bound to be a decent amount of your follower base, considering that Buzz pulls from your Google Reader followers) is going to get hit with twice the posts, so you might want to consider keeping them separate until Google comes out with more-integrated sharing functions.

You can Buzz via e-mail by sending a message to buzz@gmail.com. This works only with messages sent from your Gmail address, though, so SMS and MMS items sent through an e-mail gateway won't do the trick.

Since you can't define privacy permissions within an e-mail, you need to set them in advance. Start by sending a test e-mail to buzz@gmail.com; once it goes through, you'll see that the Connected Sites option now includes privacy settings for 'Posted via Buzz@Gmail'. Set it to Public or Private as you wish.