Elementary and Algebraic Number Theory  
   Course Notes by Ivan Fesenko, University of Nottingham. PS, PDF.
   http://www.maths.nott.ac.uk/personal/ibf/courses.html

Elementary Number Theory -- A Lightning Course  
   Notes by Jeremy Teitelbaum.
   http://raphael.math.uic.edu/~jeremy/crypt/math.html

Introduction to Number Theory  
   Lecture notes by X.-D. Jia, Southwest Texas State, 1996.
   http://www.math.swt.edu/~haz/prob_sets/notes/notes.html

Introductory Number Theory  
   Lecture Notes by Don Rideout, Memorial University of Newfoundland. PDF and Maple worksheets.
   http://www.math.mun.ca/~drideout/

Lecture Notes by John Cosgrave  
   Courses in Number Theory at St Patrick's College, Dublin.
   http://www.spd.dcu.ie/johnbcos/Courses.htm

Paul Garrett's Lecture Notes  
   With exercises and course material. Topics include Algebraic Number Theory; Automorphic (Modular) Forms, Representations, L-functions.
   http://www.math.umn.edu/~garrett/m/

A Self-learning Package in Elementary Number Theory  
   By Yui-Kin Ng, King-Shun Leung and Yiu-Kwong Man: Hong Kong Institute of Education. Report on the design and implementation.
   http://www.ied.edu.hk/has/webauth/stec98/ngyk/

Using Mathematica in a Course on Number Theory  
   By Kenneth Kramer, Queens College (CUNY). Abstract with text in PDF.
   http://archives.math.utk.edu/ICTCM/abs/10-P9.html

Course Notes by Jim Milne  
   Algebraic number theory, Class field theory, Algebraic Geometry, Elliptic Curves, Modular functions and forms, Abelian varieties, Etale Cohomology. TeX, DVI, PS and PDF.
   http://www.jmilne.org/math/

Number Theory Tutorials  
   Topics include divisibility and primes, Euclidean algorithm, and Bertrand's postulate.
   http://matholymp.com/TUTORIALS/numbers.html

Elementary and Analytic Number Theory  
   Lecture notes by William Chen, used at Imperial College, University of London (PDF).
   http://www.maths.mq.edu.au/~wchen/lndpnfolder/lndpn.html

Elementary Number Theory  
   Lecture notes by Nigel Byott, University of Exeter (DVI,PDF,PS).
   http://www.maths.ex.ac.uk/~NPByott/teaching/oldNT.html

A Collection of Lecture Notes  
   Various topics by Franz Lemmermeyer.
   http://www.fen.bilkent.edu.tr/~franz/LN.html

Math Courses at UIC  
   Course handouts, lesson plans, and other resources compiled by Dan Bernstein.
   http://cr.yp.to/courses.html

Expositions and Notes  
   Topics in Sieve Theory and Combinatorial Number Theory. Ben Green, University of Bristol.
   http://www.maths.bris.ac.uk/~mabjg/expos.html

Topics in Combinatorial Number Theory  
   Lecture notes by Van Vu, UCSD (PDF).
   http://www.math.ucsd.edu/~vanvu/262/

Notes on Elementary Number Theory  
   By Bruce Ikenaga, Millersville University (PS).
   http://marauder.millersville.edu/~bikenaga/numth/numnote.html