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In the Wikipedia article Timeline of Mars Science Laboratory it is mentioned that at the first MSL Landing Site workshop, 33 potential landing sites were identified, and that by the second workshop in late 2007 the list had grown to include almost 50 sites.
To be able to collect information about the most interesting regions on Mars, which were all those potential landing sites ?
As far as I can tell, the 50 figure is somewhat erroneous/only approximate which is (understandably) caused by the confusing way the proposed landing site list changed during the selection process.
I've attempted to collate the information from the Landing Site Workshops overview which has all the presentations and announcements from the entire process. In particular the First Workshop site list, the Second Workshop Program and the Workshop Announcement which states (emphasis mine):
The primary goal of the second workshop will be to evaluate the 33 sites that emerged from the first workshop as well as any new sites proposed within the framework provided by new Mars Reconnaissance Orbiter (MRO) data for the sites, the science requirements of the MSL mission, and a better understanding of the MSL engineering requirements and the safety of the landing sites relative to these requirements.
Before the start of the 2nd workshop, 3 more sites had been proposed, increasing the total to 36 sites. By the start of the 2nd workshop, 9 sites had been dropped and a further 24 sites had been added or sub-divided from existing sites. This gives us a total of 60 sites considered with 51 sites lasting to be discussed at the 2nd workshop.
These changes are mostly outlined in the General Assessment of Safety of Prospective MSL Landing Sites.
In any case, by the end of the 2nd workshop, the shortlist of 6 sites had been selected. It's interesting to note that all the shortlisted candidates were proposed in the 1st workshop.
Collated (raw data on Dropbox) with lots of help from @BlueCoder:
Note: this table is my own work from summarising the publicly-available data on the workshop site and therefore may be incomplete. Thank you to @BlueCoder for fixing all my mistakes! Please use the raw data freely
Have a look at this page, with links to MSL Landing site Workshops.
It has the 33 landing sites list of the first workshop.
There's also a link to the presentations of the second workshop. The "Overview of Process and Goals" presentation by John Grant contains also the Workshop agenda, where you find the 51 sites list.
You might also want to check this article, which details the whole selection process and offers the list of all 59 landing sites eventually considered:
https://repository.si.edu/bitstream/handle/10088/17045/201182.pdf
