That way I won’t loose track of the mail I really need or want to do something more with. 
Another great thing about Smart Mailboxes is that although its findings comes from various places in my mail it is not aliases. … Every once in a while I look at those boxes and send it to the trash to free up some mails from the Inbox. 
Another similar idea for some of the Smart Mailboxes is to keep separate track of all the mails that I get related to social media like Facebook, Twitter and LinkedIn.
apple
Sync Things easily between Macs
I have been using me.com (former mac.com) service from the time it started ([email protected]) but I have to say, that although I like it a lot to host my pictures, sync my iCal calendar and more, it is very slow for me. … Dropbox is similar to the iDisk in that a centralized server somewhere out there makes a copy of everything you put on it and if you open your account on another computer you will have a copy there too.