Apart from J. B Nation's (revised) Notes on Lattice Theory, is there any other (mostly introductory) material on Lattices available online?
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For something brief to begin with see the notes by Eric Rasmusen, the introductions to lattice theory by Zukowski and Wang, and the Notices article by Giancarlo Rota. Also see the website of this course which contains some notes. 


There is Burris and Sankappanavar's free book A Course in Universal Algebra. 


Old thread, but who knows this might be useful to someone. A video lecture on Lattices: 

