Difference Equations to Differential Equations - Difference Equations to Differential Equations.

http://math.furman.edu/~dcs/book/

Ordinary Differential Equations - Course notes by Klaus Schmitt at the University of Utah.

http://www.math.utah.edu/~schmitt/math6410.html

Differential Equations in Banach Algebras - Fuchsian Singularities of Linear Ordinary Differential Equations in Banach Algebras. By Gerald Albrecht in Wuppertal.

http://www.gwfa.de/math/Fuchs_1996.pdf

Differential Equations Notes - Postscript notes on various topics in differential equations by Bruce Ikenaga.

http://marauder.millersville.edu/~bikenaga/diffeq/deqnote.html

Partial Differential Equations - Lecture notes on Analysis and PDEs by Bruce Driver at UCSD.

http://math.ucsd.edu/~driver/231-02-03/lecture_notes.htm

Differential Equations - Postscript notes on various topics in differential equations by Bruce Ikenaga.

http://marauder.millersville.edu/~bikenaga/diffeq/deqnote.html

arXiv Front: AP Analysis of PDEs - PDEs section of the mathematics e-print arXiv.

http://front.math.ucdavis.edu/math.AP

MathPages: Calculus and DiffEq Notes - Kevin Brown's compilation of postings including many topics in differential equations.

http://www.mathpages.com/home/icalculu.htm