Jason Lam has been writing this e-book for quite some time, but thankfully he releases updates to it every so often. I keep pointing people on j2me.org and other community sites to this book (PDF) for insight and help with midp2 development.. so here is the link to it..
http://www.jasonlam604.com/books.php#j2megamingVery good and for all those students out there that keep asking where they can get a free j2me book or tutorials, this is probably one of the best places to start.