There’s a slight, but fairly significant, bug present in WordPress 3.3. If you try to (where you are an administrator on your site) you can set yourself as a subscriber and therefore lock yourself out of your own site. Consider this a public service announcement to let you know that you can set yourself as a subscriber, so you are conscious about not doing it.

For the curious, currently within the bulk editing tools on the Users Dashboard page you can select yourself and set yourself as a subscriber (or technically any other role).

There’s a fix pending for WordPress 3.3.1 that was recently committed, so just make sure you don’t do it between now and the 3.3.1 update and you should be fine.