PostgreSQL back end to Excel ap

I am in the early design stages of an Excel application that needs a 
database back end.  The Excel front is primarily due to client 
preferences (oh, how they love Excel) and the many 
spreadsheet-appropriate calculations, manipulations, and graphing that 
will be done with the data within the application.  Using Access to hold 
the data has been our solution in the past and since I am actually being 
given the opportunity to suggest alternatives this round, I am hoping I 
can use PostgreSQL instead and use this as one first step toward knowing 
how to develop a non-ms bound solution to these types of "spreadsheet 
models" we are often being asked to develop (discussion of alternate 
front ends is a topic for a different time!).

So, given that, what I am asking here is simply for some advice from 
users who have done this - link PostgreSQL data into Excel - on what 
solutions tend to work best.  The ones I know about now involve ODBC 
(looks very well supported on the PostgreSQL end), ADO (have used this 
with Access) and ADO.Net (haven't used this, but wonder if it might be 
worthwhile looking at for future compatibility with Office 2007...ugh).  
My application will need to pull from and write back to the database 
frequently, the database will be stored locally on the computer running 
the application, it will need to be fairly easy for clients to install.

Thanks so much for your thoughts!

~Kelly

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Kelly Close
Hydrosphere Resource Consultants, Inc.
1002 Walnut, Ste 200
Boulder, CO  80302

(303) 443-7839
http://www.hydrosphere.com