MEG papers
This is the [http://www.martinos.org/meg/pdfs/1993-Hamalainen-RMP.pdf MEG bible], with lots of information on all aspects of MEG measurements and analysis:
Magnetoencephalography: theory, instrumentation, and applications to noninvasive studies of the working human brain Matti Hämäläinen, Riitta Hari, Risto J. Ilmoniemi, Jukka Knuutila, and Olli V. Lounasmaa Rev. Mod. Phys. 1993, vol 65, 413:497
Look here for a slightly shorter [http://www.martinos.org/meg/pdfs/2009EncycNeuroSc.pdf Introduction to MEG by Cohen&Halgren].
This is an [http://www.sfu.ca/~jmcd/courses/925/papers/Picton%20%281995%29.pdf overview and introduction to ERP and ERF analysis].
For MNE-related papers, look at the corresponding [http://www.nmr.mgh.harvard.edu/martinos/userInfo/data/MNE_register/MNE_Reading.html MNE publication list].
For SPM-related papers, you'll find links on our [http://imaging.mrc-cbu.cam.ac.uk/meg/SpmAnalysis SPM analysis page], or on the [http://www.fil.ion.ucl.ac.uk/spm/doc/ FIL pages].
Look here for an [http://www.mrc-cbu.cam.ac.uk:8080/research/eeg/eeg_intro.html Introduction to EEG/MEG analysis].
Look here for [http://imaging.mrc-cbu.cam.ac.uk/meg/MEGpapersCBU Recent CBU EEG/MEG Publications].
You can find the books [http://books.google.co.uk/books/about/MEG.html?id=s1VfR1T3P08C MEG: An Introduction to Methods] and [http://mitpress.mit.edu/catalog/item/default.asp?ttype=2&tid=10677 An Introduction to the Event-Related Potential Technique] in the CBU library.