This is the second in a multi-part series on free alternatives to Apple’s MobileMe services.

If you’re like me, you like to be able to have access to some of your files wherever you might be. MobileMe has a great online storage option with their iDisk, but you want cheaper? How about free? Then Dropbox might be the service you are looking for!

Dropbox is an online storage/folder sync service that ranges in price from Free for 2GB of online storage up to $19.99 per month for 100GB. So, what does Dropbox offer you? How does simple storage sound? After signing up for the Dropbox service and downloading the installer program for your computer, you get a Dropbox folder installed on your Computer. This folder is then synced to their servers. You can access this folder via their website or you can run the installer on another computer you own and then Dropbox will copy the contents of the synced folder onto that computer as well. Anytime you add a file or delete a file from your Dropbox folder, that change will then be synchronized to all copies of that folder on all your computers. Not too bad for free.

Have an iPhone or iPod Touch? Well, there’s an app for that! You can download the Dropbox application from the iTunes App Store and with that, you can browse the synced folder that is on the Dropbox server and even open files, such as PDF’s word docs, images… all from your pocket device!

What’s that you say? You want more features? Okay then, how about shared folders? That’s right, you can even share folders with your friends, so they can upload files and retrieve files from your Dropbox. More? Okay, you can right click on a file in your public folder located in the Dropbox, select “Copy URL” and then email that link to someone to download that file from the Dropbox. Need more free storage? Well, you can send referral emails from Dropbox and when your friends sign up, you will get another 250MB per person, up to a maximum of 3GB total.

I know that 2 to 3GB of online storage can’t compare to the 20GB that you get with a paid MobileMe account, but hey, we are looking for free here. Another service, SugarSync, also promotes free storage and an iPhone app as well. If you have another suggestion for free storage, let us know!