This question has come up in multiple engagements, and I suppose will continue to come up…..how can you spell check Project Detail Pages? This has been a perennial issue with SharePoint, and only gets to be more of an issue now that we have multiline text fields available in Project Server 2010.
I am sure that there are complicated technical solutions out there….but for now, I might recommend downloading and installing the ieSpell application. It’s a lightweight add-in that installs into Internet Explorer, and spell checks text in forms on the page – including as I confirmed this week, the Project Data webparts on the PDP page. Free for personal use, but requires license for commercial use. (Note the licensing restrictions.)