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Is there a national site or state site that will allow me to download High Res (1') aerial imagery of California?

I have tried Cal-Atlas Download but they are at one meter. I have also tried USGS Viewer and selecting by county, but when I do that it gets broken up into 100+ chunk images and only covers about 10% of the county.

The specifics of what I am looking for is California High Res aerial imagery (1') by counties. Mrsid would be ideal, but JPEG2000 is fine too. Mosaic would be ideal, but tiles are fine as well.

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For those ArcGIS users out there, USDA-AFPO has a webmap service for the current national-level NAIP imagery. You can set it up as a "GIS Servers > Add ArcGIS Server" service in ArcCatalog. The URL is: http://gis.apfo.usda.gov/arcgis/services

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Try the National Map, I don't know where you're looking in CA but I just zoomed around a bit and found 0.3m resolution aerials in the San Joaquin valley and in the Central Valley -Lower Sacramento River. Just navigate to the area you're interested in, click "Download Data" in the upper-right, and draw a bounding box. There also seems to be a set for Napa county. I doubt 1-foot imagery is available for the entirety of California though.

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Most orthoimagery at less than 1m resolution is purchased/licensed at a regional scale rather than statewide. You'd do best to either contact GIS or Planning staff at individual counties or contact a vendor such as Eagle Aerial or Pictometry. Also, you'll likely find there are few if any imagery at that resolution that is available at no cost.

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I got 1ft/pixel images as tiled non-georeferenced images by using GMapCatcher - I'm looking for a way to use that for >fast< browsing, with arcgis explorer, either as an offline tiled dataset or by converting to mrsid: the GMapCatcher browser is great and lightweight, but we're looking for something more useful.

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I don't know what USGS viewer you are referring to, however I am sure that earth explorer has 1 M gsd of JPG 2000 aerial imagery. This is NAIP imagery that I am speaking of, however there are other data sets for you to choose from.

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