RKILCOYNE  Great news! Also, take a look at rrdtool for generating very nice graphs. An additional graph for indoor temperature would also be nice.  
(Version 0.0.1pre1)

RKILCOYNE  Just read that this software stores the XML in a file:

The data is saved as an XML file in text format as key-value pairs in your user Library at HWCData/location/year/month_HWC_Data.xml (for example the data for April 2007 for Location 1 for would be ~/Library/HWCdata/Location1/2007/4_HWC_Data.xml).

I think that takes care of my feature request...  
(Version 0.0.1pre1)

RKILCOYNE  Works as advertised! I'm using it with a WS-2316 I picked up from Costco for my Wife as a Christmas gift.

All I had to do was head to the FTDI website to download the OSX virtual serial port usb interface driver. (http://www.ftdichip.com/Drivers/VCP.htm) Once I installed this driver, rebooted, and fired up LWC, readings were retrieved immediately from the WS-2316.

One enhancement request: Export data as XML so users can incorporate data into their own Web pages. While it works VERY well, the Web page generator included with this product creates circa 1997 HTML.  
(Version 0.0.1pre1)