I spend a lot of time on computers, the internet and working with documents. Naturally I find it necessary to access my internet bookmarks, documents and other miscellaneous data wherever I am. Up until a year ago this was mostly impossible unless I had a VPN to my home network which is not the most practical or efficient option. I mostly use Firefox for browsing the web due to a few add-ons that make it very beneficial for me, one of which gives me the ability to sync my bookmarks online and access them in any web browser via a website if the computer I’m using does not have Firefox installed. Xmarks has really helped me out in certain situations are work and at a clients house when I needed to access a particular website. Xmarks also syncs with Internet Explorer which is also helpful for me as well. Another handy add-on that I use a lot is Toodledo, it allows me to create and organize tasks via their website/add-on for Firefox.
Microsoft has recently been working on a new product called Office Live, it allows you to upload, share and manage documents online, there’s even a plugin that allows you to access and save documents within Office which makes syncing much easier. Skydrive is another product from Microsoft that allows you to store photos, files, etc one of which I use for certain storing .exe files and config files. My other favorite cloud computing tools is Live Mail or better known as Hotmail; it allows you to have up to 500GB of mailbox space for free, it has calendering system, contact system, Skydrive, Office Live and when you're home and want to access that data via an application (which I prefer) you can use Microsoft's Windows Live Mail client and Office plugins to access that very same data.
Synchronization is not where I'd like it to be, but the technology is progressing and in a few years I see the ability to sync everything such as web browser settings, bookmarks, profiles, documents, etc and have access to them wherever you go.