The Spinward Marches are all over the place.
To see things from a TNE perspective (which will give both 1200 and 1117 data), go here:
http://www.panpub.com/traveller/
For a pure 1105 perspective, you can try (oddly enough:
http://www.spinwardmarches.com/
or
http://zho.berka.com/data/spinward/
or
http://www.jtas.org/travelleratlas/Sectors/Spinward_Marches.html
For the Solomani Rim, you have slightly fewer choices. The zho.berka.com site will have an ascii map of the Rim. The Traveller Atlas should have the Rim, but the file appears to be missing.
You can find a PDF of both subsectors at:
http://maps.grandsurvey.com/
There are other places, but these are the ones I can find quickly.
For print, get the Classic Supplements Reprint as it has Supplement 3 (the Marches), Supplement 10 (the Rim) and Supplements 8 and 11 (Library Data).
The Spinward Marches information is also in the Spinward Marches Campaign module, but that is hard (and expensive) to get.
The Solomani Rim information is also in Alien Module 6, which is slightly easier and less expensive to get. Also, FFE is supposed to be releasing the next Reprint in December which will be either Alien Modules 1-4 or 1-8.
TNE material for the Spinward Marches is contained in the Regency Sourcebook. This is useful even if you don't plan on doing anything TNE, as it also details classic era information as backstory to the "current" TNE information.
I can't help you with MT stuff, as I have none of it available (except the 4 color Marches map that came with the original boxed set).
Finally (though I doubt you care) in GURPS Traveller, the Marches is detailed in Behind the Claw and the Rim is detailed in Rim of Fire. The first is OOP, the second is still available.
Hope some of this helps.