GeoStor provides DOQQs, DRGs and much more in an FTP-able format. You'll find 1990 and 2002 DOQQs in MrSID and TIF formats. There's also Landsat images as well as 1:24k DRGs - See http://www.cast.uark.edu/cast/geostor/raw_DOQ/index.html
U Arkansas GeoStor
