In terms of scrambling, I think the time you can start contacting programs is 11-12 noon (i'm not completely sure, but I think the times are on the nrmp site). You typically just use ERAS to send your application materials, I didn't have to fax anything to any programs on scramble day last year. You also need to call the programs to ensure they really do have open spots, as some were erroneously listed last year. It's typically hard to get through to the program coordinator (secretary) and next to impossible to speak to the program director. You should use your resources, i.e. rad onc mentors, to see if they know anyone at the programs with openings. Sometimes this is enough to secure an interview.
That's the other thing, at best expect to walk away from scramble day with an interview offer as opposed to an actual position. Last year most programs with spots, to my knowledge, took a few weeks to review the candidates and then invited them for interviews.
Overall it's a hectic and stressful time period. It was about august when I finally got my offer for a 2008 spot. You just need to stay positive, keep in contact with your home department and let everyone else you know in the field (even programs you interviewed at) that you are looking for a position. This can pay off, as I actually got an offer for a 2008 position interview as recently as 2 months ago. It can also help to get in contact with the president of ARRO to let them know you are looking for a spot, as sometimes they hear about open spots sooner. Not matching isn't the end of the world, in the past year there were a number of spots (8-10?) that were either not matched or opened afterwards, for which an interview was highly likely for an unmatched candidate.
hope this is helpful, but hope you don't need this advice come tuesday. Best of luck.
