QuickShareIt is a Mac app that provides online storage and file sharing with both Mac and PC users. It's growing up amongst a host of similar products, but differentiates itself by offering some unique features centered around the teaming of its dock icon drop-box, "recent uploads" floating panel and web-based file access. For example, if you drag multiple images onto the dock icon, it will ask you if you want to create a gallery. When the upload finishes (with Growl notifications), it will give you a url that you can share and provide options for handling that gallery in the floating panel. It also accepts text clippings and creates a line-numbered, online document for quick sharing of code samples or text snippets. Previews for other filetypes are available.
Right now uploading to QuickShareIt is anonymous and public access. The developers are rolling out registration options in the near future, as well as paid options with extra features. If you want to try QuickShareIt out, just download the application and run it. There's no configuration or sign-up necessary (despite the option being present), just drag files or text clippings onto the dock icon and watch it go.