Mendeley can attach multiple files to a document reference, hence allowing to add suplementary information files to original papers. However, it would be valuable if a more specific "supplementary information files" section was there. For instance the supplementary pdf's could have a proper name, not just a numbered copy of the paper's name. They could also be searched and displayed distinctly from main articles which I guess could be useful.

Synchronize tags, notes, etc between identical files in My Library and Shared Groups

Mendeley crash every time when there are Chinese character in the PDF file, I think it's really boring. I think it is a requirement to support these documents. If you need any documents to do some experiments, you can contact me.

Sometimes it is necessary to keep a file to print or for other purposes. So, I think that is necessary a way to export these personal annotations (tags and notes, for example) to a single text file.

I've linked my local pdf store, that Mendeley indexes, to Dropbox - https://www.getdropbox.com/referrals/NTk5NzE0Mjk - because that synchronises my PDFs across the many PCs I work on, and allows me web-access to them from anywhere else, too. A way to link from Mendeley to my Dropbox store would be great - perhaps the field that stores local links to PDFs could also take URLs?

BibTeX export has issues with multiple special characters when exported, I believe an easy fix would be to add surround all escaped or modified stuff with {}.
Example, the swedish letter "å" is exported to "\aa " which contains an extra space, just using "{\aa}" would fix the issue.

This was in 0.5.x and was very useful.

It should show the first page of the PDF (possibly flashblock-style to improve speed), with the option of navigating to later pages (sometimes the first page is a useless copyright notice).

Would be good if you can use it to click on the DOI (if it wasn't detected).

if have 100+ references (and i will soon have 500+ references in my thesis), then after adding a new citation into text i had to wait about 20 seconds before i could use Word again ...

Zotero has a similar problem, maybe even longer lag, but this really inhibits serious work

PDF viewer with annotation/highlight features

Search integration to locate papers in library

Share integration to send papers/annotations to contacts/group

Device integration to allow printing of papers/annotations

Secondary tiles for quick access to library folders and live group updates

Academic profile and groups management

Link Mendeley network contacts to People app

User should have the option to open all files externally by default (i.e. double click a file, it opens in Adobe or Foxit or whatever).

I would like to be able to print an annotated bibliography using the citation style of my choice followed by anything I have entered in the "notes" box for the records I select.

You already extract pages, volumes, etc. Why not include this in the file renaming tool?

The comment and highlighting functions in Mendeley are great. However, I would like to have the option to save these changes straight into the pdf. The markups are very important for me in my work and I'm afraid that they will all be gone if I should for some reason loose my Mendeley installation. Additionally that way I can send that pdf and my collegues will see my markups. At this point I'm still doing my markups in another program because I know they are safe there (saved inside the pdf document). I don't have that feeling with Mendeley yet.

Hello,
since you have already a version for the iPhone and iPad and are working on an Android version, how about a version for Windows Phone 7? Since it has full Microsoft Office capabilitis Mendeley would be a very useful application for editing manuscripts on the go!

Mendeley views PDFs in one-page continuous mode. Let's be able to also read two pages a time. In Adobe's software, this is called "Two-Up Continuous." This would be helpful for users with wide computer screens.

Integration with a BibTex file shoud go both ways: if I update my library in Mendeley, I get a update .bib file, and if I update a .bib file, I get my library updated.
We should have the possibility to choose a .bib file to use like this.

Also, I noticed that many latex characters aren't correctly parsed, like í (\'i).

Please let users be able to customize the font of mendeley desktop. Now the default font is a little small and not beautiful.

Support pushing bibtex citations to Latex editors via a mechanism called lyxpipe. Several editors use lyxpipe, I know at least of Lyx and Kile.
Check here for a good explanation of lyxpipe:
http://forums.zotero.org/discussion/537/lyx-support/