I maintain the Ubuntu Build Notes for QGIS. Since I've just reformatted my hard drive, I took the opportunity to finalise the documentation for building QGIS 0.8 from source. I've split the old monolithic document into separate parts. The aforementioned link takes you to an index page which will grow over time as new versions of QGIS are created. Anyway I hope these updated build notes for 0.8 will help some of my fellow Ubunti-ites out there...