If you find any other helpful websites, or have comments about any sites, let me know and I'll post them here. I often give a little extra credit for such contributions.
Linear Algebra Topics (thorough and well-organized, from Wolfram Research)
The Author's Web Site I recommend the True False, which requires no special plug-ins.
FIU Help (not specificly for Linear Algebra)
Linear Algebra Links (Drexel Univ )
Harvey Mudd Univ tutorials
These two are from MAS 3105 students of the past (some links may be broken by now)
The Karol Martinez Page her favorite LA links; 6/15/02
Jessica Ruiz's Links and Leslie Gallardo's Links; 6/15/02 (compiled by me)