A few people have asked how they can contribute to PostGIS work and sadly PostGIS is very disorganized in this area. Part of the problem is no one knows if setting up the work to collect the funds would be worthwhile, whose job it would be to do it, how that person would be reimbursed for the accounting work needed, and how that money would be distributed.
That said, I have decided to start on my own to ask for funding for the recurring PostGIS maintenance work that I do and to treat it as consulting income. This is partly to test the waters to see if getting a more formal funding setup is worthwhile and also so I can devote more time to PostGIS maintenance without becoming a pauper. If you are interested in funding PostGIS maintenance work, refer to this page Paragon PostGIS funding.
It is my hope that eventually we'll have a specific PostGIS fund managed by the PostGIS PSC that can be used to support the work of package maintainers and subsidize travel expenses of PostGIS developers. The PostGIS developer group is very global and getting people together or to go to conferences is expensive. Sadly many of the developers on the PostGIS team who would love to attend conferences on PostGIS behalf are not able to do so. I almost want to cry every time I hear this. Perhaps one day the PostGIS development group can afford to be in the same room together.