Accessing your S3 data from Wakari is fast and easy. See the Public Data Files in Wakari for examples of how to use boto to pull your data from S3 into Wakari. You can also use IOPro to simplify and optimize converting your data into python arrays.
Files can easily be uploaded into your Wakari account using the upload controls in the File Browser. Press the upload button (the one with the up arrow on it) to show the Select Files panel.
Select the files you want to upload, then press the Upload Files button.
Remember to click on the refresh button (the circular arrow on the far left) to update the file listing in the File Browser after you upload.
Dropbox access is coming soon. You will soon be able to connect to your dropbox folder and see all of your dropbox files in Wakari.