Integration with Clicktime would be great. This can be achieved by the product codes being the id of the value in click time, comments are considered notes and then automatically do 15m blocks. Currently I am using Klok and taking the report and manually adding it in but I used just about everything directly from Klok.
Clicktime has web services and all you need to do is request their WSDL and documentation from the support area of the web site.
Regards,
Mike