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Maybe I can sort of guess at the answer to my questions, but I'm not sure, and am also unsure about the optimal settings.
First the profiles:
When you choose prs-500, you get portrait. To see landscape, you need to hold down the size button on the Reader until it switches to landscape mode.
When choosing prs-500-l, you get landscape orientation even when the Reader is set to portrait. It's rotated to the right, presumably to allow the right thumb to change pages.
Next the Layout mode:
It seems that portrait will set the dimensions of the output to show the whole page on a single screen.
Setting it to landscape will cause it to be "wide and short", i.e. landscape dimensions that only look good when you switch the Reader to landscape mode so you can see all of it.
Landscape-half appears to cut the page in half and do landscape output for each half of the page (which the Reader then displays one-half at a time also, making for 4 screens per page on the original).
The disadvantages of landscape-half appear to be the following:
* Lines can be cut in the middle. There is not overlapping of the cut, so it can be hard or impossible to read the line that was split.
* When mixed with the Readers choice to do some overlap automatically in landscape mode, it can be confusing to read because it's not obvious what has been repeated and what is missing (e.g. cut off in the middle of the line and not repeated).
My tentative conclusion:
1) First try a few pages with Landscape/Prs-500
If you can read it at that size (with the Sony Reader in landscape mode), stick with it because that's the more natural version.
2) If you need a larger size, then use Landscape-half/Prs-500
You will have odd page breaks, but at least you can read it unless a line got split in a bad way in the half-page split that PDFRead made.
3) If you have something like a presentation (e.g. two slides per page, one over the other), then just use Portrait/Prs-500 because the slides are probably very large lettering, so you can shrink it a lot. At least that worked in the document I used it for. Actually, I didn't try it, but that sort of document is probably even readable by moving it directly to Connect from the original .pdf also.
Please take the above as the naive descriptions of someone that doesn't know what he's doing yet. Feel free to correct me and add other helpful info, or confirm parts that you folks agree with. I would really appreciate input on a better way to do this!
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