That's an interesting insight, Bradley. It would be interesting to try to think of ways that a free software project could "interrupt the flow" for fund raising without interfering with the functioning of the software. I think it also helps to have specific targets and limited fund raising periods. Projects have wiki pages, download pages, and mailing lists. Messages could be placed there. For rapidly released projects, perhaps a release cycle could have fund raising messages in documentation or startup banners. Distributions could consider cooperating with appropriately tasteful fund raising drives and pass along messages during installation or upgrade of packages. For organizations such as SFC, interrupting the flow will definitely be more challenging. Hopefully the projects you help manage would point back to you during their own campaigns.