I am often concerned about the reliability of my files (especially backups) in Wuala because not enough information is shared so I don't know what's going on.
My suggestion:
For each file, display the following:
-Integrity check (display the date and time for when the integrity of this file has last been checked (potentially using Checksum or other methods))
eg. "Integrity last checked on Sept. 2nd 2008 @ 2:54pm"
-Reliability rating (since erasure coding is used, it should be very simple to compute the reliability of each file because Wuala knows the online percentage of each user that is storing my pieces)
eg. "based on the Wuala users that are used to store this file, this file should be available atleast 97% of the time" and you could add a short comment saying "all files are also backed up on the Wuala servers" or potentially say "click here for more information on the reliability of the Wuala network"
most of the times there are quite a number of new builds of wuala for certain platforms, sometimes several new builds daily and there are a lot of days where there isnt any changelog nor releasenotes to be found.
many times only days after the actual updates/patches or only several patches/releases later there is an updated releaselog.
this is a high risk of getting some "updates" for wuala from man-in-the-middle and similar risks.
i wish that the wuala team would really announce their changes immediately, write some official buildnumber/list and maybe even some hashcode, signature or way to make sure that the wuala installation is the official code.
as wuala becomes more widespread and common out there, the probability of suffering attacks and tampered updates/patches becomes more likely.