For those of you who are into blogging like moi, it's always wise to back up your files. If you are using Word, or w.bloggar or WordPress, you wouldn't have a problem as your files would be saved in another format anyway.
But if you are blogging your entire life through Blogger's interface, I would strongly recommend that you back up your entries using this cool software called the Website Copier. The software allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. This means that it creates a mirror website of your blog, so that you can also view it offline. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online.
You would also have noticed that I have a li'l new item on my blog. It's a subscription service which allows my readers to subscribe to my blog and be updated via email every time I put up a new entry! Install Bloglet on your blog if you like to keep your friends updated on your blog entries.
Last but not least, if you are looking to change the look and feel of your blog, check out BlogSkins, Blogfrocks and Primp My Blog. You can find many original creations from people who simply have too much time on their hands! :)
Being the geek that I am, you can be sure I will be surfing for more cool stuff. Watch this space.