I was wondering, do we have any volunteers to get some SimplTests (unit testing) started for Ubercart? I would mind helping and guiding the SimpleTest development; I believe this is something that really needs to happen.

The framework is already done/started. All one has to do is extend one class, and then write the script.
e.g.
class ProductCreationTest extends DrupalSimpleTest {
function test() {
// Test code goes here
}
}

and that's it. as long as the file is included, the SimpleTest will run it. Please see:
http://drupal.org/project/simpletest
and
http://drupal.org/simpletest