Thanks for all your input.
I'm still trying to sort:
-misunderstanding of how the File management works
-wishes and clear description of what does not work for you
-frustration and statements like 'I don't like it', which you are very free to express, but won't lead to any improvement as they don't provide any clue as what/how/why you don't like it.
@rickhray - thanks for trying. I still have some questions for you:
-What is slow for you? In my experience, what can be slow and could be improved is:
-search
-mange a project/Library
Is there anything else in your experience?
-indeed the file size is limited, but it is by the Operating system. It is 2 Go on Windows XP. The tricky thing is, Live uses FLAC (absolutely lossless) compression for the sounds while packing, and this does not give the same compression ratios for different bit depth, thus making extremely difficult to know what will be the size of the pack before actually packing it. Point taken, but I'm not sure if that can be improved
-if saving all sets referring to the same material in Live 5 as self contained, you would end up with as many Sounds folder as there are sets, containing the same data, right?
-what exactly does not work for you when searching for unused files? After choosing 'manage project', you can see what files are unused, sorted by categories: recordings, frozen files etc... Then you can choose 'show', select them all and erase them at once. What else? the advantages I see in that compared to the pop up in Live 5, are:
-you have a chance to review all samples, even to listen to them
-they are sorted by categories, so you can choose not to delete cropped files while you delete recorded files
one disadvantage is that it takes further steps. We'll consider the issue. But one key fact to always remember, is that the material can be referred by more than one set, that is the huge difference with Live 5. You can see that as a non-advantage, but I'm not sure if everybody agrees.
There could be errors in files reported as used when they are not (aren't they by another set in the Project, or a preset, or a Live clip?), but same would be in Live 5, just, you wouldn't notice it. We'll still look into that.
If you still have the energy for, I would advice to go through instructions again (maybe without watching hollywood stars on TV?

) and see what works or not, so some things can still be useful to you for the time being.
@Josh Von - Thanks for your late message as it gives some precise indication of what does not work for you.
I understand your points, and certainly we have to improve the too things you point out, efficiency and Reliability, and/or the feeling of it. As I said just above, search and manage projects/Library can take time, and we are working on ways of making faster. Then efficiency can be seen as how things are accessible. Point taken, but I can't tell if and when we can propose a better way.
For your two late proposals, we may come with convenient solutions in the future, but for now, you can easily, simply, copy your resources folder into the Library by hand, using your computer's explorer. You know of course that you can choose the Library location via the Preferences right? On installation, or more after deleting the Preferences, it is definitely wrong that Live 6 asks you for a new folder to install the Library without asking you if you want to select an existing one. That is worked on.
@MR Coogs - thanks for the constructive one. There can be a squirk in the search function, and that is also worked on. It helps for now to enable 'fully rescan folders' though it could take more time. As for the 'candidate thing', what does not work for you? Once multiple candidates have been found for a missing sample, click its hotswap button, choose which candidate works better for you (by either looking at the path or previewing it, or both) and double click on it.
@shtreimel - your problem is different, it is an installation problem. You should (and other people experiencing such behaviours) write to support as they will be able to help you.
Regards,
Amaury