If you are still using IE as your browser, I highly recommend Firefox (version 2) as a browser replacement. Click here to download Firefox 2.
Here are some of my favorite firefox addons:

Click here to get NoScript
To store very large MP3 files, I use Gspace. After uploading the files, now I can access my MP3's and PDF books from any browser.
Click here to read an article on how to use Gspace.
To channel surf the web, try StumbleUpon. Here is an interview with SU cofounder Garrett Camp.