Twitter Hashtags are becoming more prevalent at Auctions.  They re free and can drive non-attendees to your donor pages or online auctions.  It's free...learn to use it!

Everyone is doing it now.  Drive traffic to your Facebook pages if that's where your supporters are at each day.

Seeing more and more QR codes being used for everythng from Registration to accessing Auction items online.

Using text messaging may be an effective tool for your organization if you have a younger demo you want to reach.  Works for smaller donations, due to limits from phone companies, on a more regular basis.