Which version of jquery.tools.min.js did you include, what I mean is what feature set? There is a possible inclusion of a date picker looking at all the options on their web page for downloads as you build your custom version of jquery.tools.min.js. They all produce the same file name as output so it could be interesting to determine which one you actually have. Sorry haven't looked at the details of how they might document that if at all.
You would have to include after jquery itself for sure in terms of load order from web2py_ajax.html. I would look for a name collision since both the web2py included date picker and jquery.tools.min.js are enhancing the jquery name space. For tools, not sure if jslint could pick up a common name between them because minified js files can be a pain to look at.
