I pretty much just do an email campaign and a letter writing campaign. I hate asking people (coworkers) in person for money. I log onto the great strides site and modify the generic email letter, add a photo of DS and send it out. The website also has form letters you can mail out to friends/family/coworkers and another one asking for sponsorships. It's in word format. I download it, add my personal info, a photo of us -- usually from the walk the year before or a photo of DS. Then I create a bunch of labels -- usually from my Xmas card list, add some friends, family members, etc. and mail it off about a month or so prior to the walk. Some people I know just send post cards.
Oh and on the site, when you log on, you can also email people to ask them to join your team. We have a few team members who aren't able to walk who still join the team and actively fundraise for us.