depends on what you want to achieve:
on de.WS, there is a monthly contest "Korrekturen des Monats"
There, several projects are highlighted, some pages by name. People, who are proofreading these pages, scrach them out (<s></s> --~~~~).
The one with the most proofread-pages earns a flower and a thank you-note at the end of the month. (that can be done by everyone; at the beginning the award it was a book of the library of a Wikisourcian) I like this pages, cause it shows the diversity of projects. You can find shorter texts to proofread and sometimes you get really involved.
For preparation someone has to find "good" texts to proofread, and to set up the projectpage.
Once uppon a time they might also have a tool to show each others the numbers of pages and brag (I have done this, You did only that. I achieved more for the project....)
-- Anika