If you are the Time machine fan, here is a very nice screen saver for your Mac.

You can download it via Deviant Art. If the screen saver is not enough, maybe a time machine wallpaper will set get you set for now.
Mac OS X has an in-built functionality of saving documents to a PDF file. This comes very handy in many situations and it doesn’t cost you a dime, unlike on some other platforms.
This is how you do it. Say you have a document in Apple Pages, a newsletter you have just created and you’d like to save it as a PDF file, so you can email it to the members of your club. In Pages click on File, then on Print, and the following box slides out:

Now click on the PDF button and you’ll see a few options. Select Save as PDF, name your file and select where to save it, and click Save. Simple as that.
One of the options I really like is Save PDF to Web Receipts Folder. When I pay for something online and get the payment confirmation page I simply select File / Print / PDF / Save PDF to Web Receipts Folder. The receipt is then automatically saved in ~/Documents/Web Receipts.
You can save a PDF of anything you could normally print; text documents, web pages, emails, screenshots, images, you name it.
One of the options that was available in Tiger (10.4) and has been removed from Leopard (10.5) is to compress the PDF document. However, there is a workaround, which unfortunately is not so obvious. Once you have saved the PDF, open it in Preview, then select File / Save as and from the Quatz Filter drop-down menu select Reduce File Size.