Best solution to get file from PC to PPC

[master4g]

Is there a very convenient way to transfer a file directly to my PPC from my pc without having to wire it up? For example, I use dropbox on my different PC's so if i have a file i want on my laptop i just place that file in my dropbox folder on my desktop and BAM its on my laptop. So if im in a rush and want to transfer something to my phone, is there something like that where i upload it to a folder and later i can retrieve it on my phone? unfortunetly there is no dropbox support for Windows mobile.