I've posted an OmniOutliner file that has the 10 heuristics from Jakob Nielsen's checklist. This is useful as a starting point if you want to fill in a checklist of sub-items beneath each major bullet. I use this as a starting point for creating the usability report.

An excellent example checklist from which you might base your individual checklist sub items is Deniese Pierotti's heuristic evaluation template on the STC SIG site. While not created for web sites, the examples give an idea of what types of questions to ask of your system/site.