On startup, Kooka complains that no scanner was found. Whats on?
Huh, that is a very difficult question to answer in two sentences. Kooka (or more precisely libkscan) needs a working SANE installation on your computer. SANE means Scanner Access Now Easy and is the only working open source scanner support project I know. Please check the SANE Websites for information about scanner installation or ask on the SANE mailinglist.