A lot of people have been reporting that submitting the miles is not working and opening the spreadsheet is taking a long time. I don't think google docs are supposed to have this kind of traffic, but people have had better luck by waiting about a minute after submitting their miles to open the main spreadsheet. Because it's on google's end, there's not much we can do to fix this.
To try and fix this, I've embedded the form and spreadsheet on separate tabs within the blog under the headings View Miles and Enter Miles. If viewing and submitting still doesn't work using this method, feel free to let us know.