Kenneth, you are welcome.
Don Taylor's firm is called The Bookbinding Studio. HE is on John Street in downtown Toronto just North of Queen. The phone number is 416 591 8801.
I printed that number of dofferent pictures by first culling them from a total shoot of about 2400 shots and ranking them in Adobe Bridge. Then over a period of several months I processed them through ACR and PSCS2 one by one, keeping them in chronological order. There is only one image per page and the page size is all 8.5 by 11 inches. The usual print size is about 6 by 9 inches on the page, allowing about an inch margin all-round but that varies from image to image depending on cropping.
I use a Canon 1Ds which produces a "native" 6 by 9 inch image at 451 PPI if you do NOT resample (only re-dimension) in Photoshop. Keeping that number of PPI for an image this size then allows me to re-dimension (NOT resample) for A3 at anything in the range of 240 to 360 or so PPI depending on the cropping again. First I do all the images I wish to retain in letter size for these bindings. Then I go through the lot and see which ones simply cry-out for larger size. Alain Briot wrote an excellent article about right-sizing photographs. My approach is a bit more intuitive. When I look at a photograph and it tells me it's trying to reach beyond its borders, I know it needs to be bigger! I have no other decision process for the paper size, except that I like to make anything except family snapshots in the letter size range (family snaps usually smaller), and I don't find it practical or necessary in my cirumctances to exceed A3 for the "fine art" stuff.
When I collate two smaller shots on a letter size sheet I do what I mentioned in the article: create a standard blank template full page size for 360 PPI. Then I open each of the images to collate on that blank template and downsample them to 360 PPI at the dimensions I need to fit the page (it will comfortably hold two 4 by 6 inch images), then simply layer them onto the blank template, move them into position using the move tool and the grid, flatten, print, unflatten and remove the images from the template. This is the poor-man's procedure for those of us not using a RIP.
Hope this helps.