If you look back though duel listings there aren't too many...

If you look back though duel listings there aren't too many organisations I am aware of where the listing has had a significant impact on the SP locally (not to say that there aren't any out there). The benefit (IMO) will be the ability for AZH to raise capital in order to continue with the growth of the maiden resource and eventually to build a working mine site.
The TSX has proven to be one of the most active mining index around the globe. EY suggest that 80% of the total number of mining financings have occurred on the TSX and TSX V. Some other interesting facts from EY's report on TSX Mining Index:
1) 2005 through 2009 there where over 600 mining listings on TSX in comparison to 300 on London Exchange and 200 on ASX.
2) 2010 - TSX Mining index increased 33% in comparison to the broad S&P/TSX composite which rose 13%.
These type of figures support that long term the TSX listing will offer significant upside in regard to the ability of management to perform in a way which will increase SP.
Also makes sense to list on an exchange close to the time zone that their mine operates.
In the ST though, look at gold in general and the sector is weak. The most price sensitive announcements in the coming months will be the JORC along with consistent and continuous strong drilling results (IMO).