One, SSH Tunnels. SSH Tunnels are useful if you ever need to surf the web securely and you're on public or untrusted wireless (say at Starbucks) or when a website is blocked by a firewall and you need to access it.
SSH Tunnels are actually quite easy. Assuming you've got ssh setup on the remote server and an account at that server all you have to do is run "ssh -D 8080 firstname.lastname@example.org". Once you're logged in, open the Preferences for your web browser. This example will use Firefox 3. Go to Edit->Preferences, then the Advanced section, the Network tab and click Settings. Click the "Manual Proxy Configuration" radio button and under SOCKS Host put "localhost" and set the port to 8080. That's it! Surf away.
Two, resetting your wordpress admin account password. This is useful if you're such an idiot that you forget to change the random password that's initially on the account after you install wordpress. It assumes you have an ssh account to the server hosting the blog as well as access to the database tables for the blog. SSH into the server and run "echo -n your-new-password | md5sum". Copy that down and hang on to it. Then run "mysql -u user-with-access -p". Then run the following commands:
UPDATE wp_users SET user_pass="md5-you-wrote-down"
Check to make sure it went through with "SELECT user_pass FROM wp_users;" then type "exit".
Yep. It's good stuff. That's all I've got for now. I'm hoping to post up some mostly finished SICP sections in the next few days. If I'm lucky I'll even write something intelligent about education.