.Mac
At $8 per month, .Mac has been very useful for me. I suppose each to his or her own. Having my address book, calendar, bookmarks, and iDisk available to me at work (while I'm on a PC, yuck!) has been invaluable. Because information and files are accessible via .Mac, I find that I don't need to carry a flash drive or a PDA. Also, Homepage is great when I want to get something on the web quickly, and I only use a WYSIWYG web page program when I want to do something other than work with Homepage templates. The .Mac SMTP server offers options to get around the port blocking of my local ISP for sending mail. .Mac also hosts my weblog, and gave me free software (iBlog) to manage the weblog and back it up offline. Having a public folder for sharing files is great. Also, my .Mac webpage and its content have not appeared in Google or other search engines that I have checked (recently). Not a guarantee of privacy by any means, but I like the fact that I am a short detour off from the information superhighway.