Comparison of reference management software.

Such an hard and complicated topic is up next.
 We are still in a transition between paper and paperless workflow.
Yet it's safe to say that most of us have do deal mostly with .pdf files.
So how do you organize, search and share them?
I've seen a lot of people still going the old school folder-tree way. I must say that after all it's not the worst way ever, provided you lose an insane amount of time creating manually every folder with the right name,date,journal etcetc. Not really a good way of doing things in 2011 in my opinion.
Do you share papers (NOTE:people you share papers with must have legal access to those papers anyway) sending them by mail, printing or what?
I find all of those still time costuming, and after all not that reliable. 
Luckily for me and for all of us a plethora of reference management software have been developed.

After an year of trial and error I'm going to share a real word comparison between some of these software.
   (for a complete overview head to Comparison_of_reference_management_software wikipedia from here i will take some information too.)

The contenders:
  1.  mendeley 
  2. endnote
  3. zotero
  4. bibdesk
  5. quiqqa
  6. papers2
Now it's time for you to think about your workflow: fast internet access, sharing with colleagues, multi platform, free(both as free beer and free speech ).

The battle will begin in the next post. Stay tuned