Wow, this is a pretty old thread, but a goody nonetheless.
Let's see if I can throw my own favourites in there.
Dreamweaver MX 2004 (Upgraded to DW 8 )
Photoshop CS
Notepad (for simple stuff)
(for formatting newsletter and more advanced text editing)
(for local testing)
with a slew of a extensions
IE (strictly for testing)
(for testing in every other browser)
(previously, w.bloggar)
Word
(for social bookmarking)
(to send newsletters with my feeds)
Of course, I'll use my own tools. Some are available, some aren't.
Domain Manager (for keeping track of my domains and passwords)
This is a list of the books I reference often (and sometimes, every day). I know you said products, and books are products.
PHP an MySQL for Web Applications
(also comes in available from Amazon)
Excel
Adobe Acrobat 7 Pro
(e-mail management)
(working on using IM more often...)
(conference calls)
I'm sure there are a few other things I'm leaving off the list, but that's what I can think of off the top of my head...
~ Teli