I did 2 things. First was to get my self a Thule trash bin to keep my car neat:

The second is to get myself a Thule Go Bin, which includes places for drinks, food, and theres an accordioon-file area for laptops, folders and papers. I keep this on the front seat. If I have passengers, I move it to the cargo area.

Id like to see what other people have done.

Your garbage holder's looks pretty good! Does it get in the way at all for rear passengers? I've been using a plain ol' plastic bag hung from the passenger seatbelt buckle, which looks slightly ghetto...

I also use an after-market cargo organizer (low cost) below. Caveat is it doesn't stay exactly in place because of my rubber cargo mat (organizer uses velcro to stick to trunk carpet), but it sure beats everything sliding and rolling around in the trunk.
http://www.amazon.com/Highland...uto_4

I moved the bulky cargo pouch, which contains the manuals, to the the spare tire cavity.

The lower part of the trash bin ends above the rear passenger's knees, so no real space is lost. As long as they don't realize it's for trash, then they're OK. When I'm alone, I flip it around to the front of the front passenger seat. It's a very safe trash bin, the large top opening flips up so its easy to dump your drinks, toll receipts, burger wrappers, etc. I believe it's around $10.

I think I have the exact same cargo organizer as yours in my Accord..