myCopernic is a cool new PC/BlackBerry application that allows you to access and search files on your PC direct from your BlackBerry smartphone. It does so by having you download a "connector" application which when installed creates a link to your BlackBerry direct from your BlackBerry's web browser.
With the link created, you can then download OTA documents, pictures, movies, music and pretty much what ever else you could possibly need to access. The service itself is a great solution and the cost is relatively small for such features as it sells for $9.95/year. Sadly, no mac support is as of yet available nor is their a free trial to check out.