The new Health Analyzer in SharePoint 2010 is great and you should always try to clean up all errors in this list. One error I had after installing the RTM version of SharePoint Server was:
[MissingWebPart] WebPart class [8d6034c4-a416-e535-281a-6b714894e1aa] is referenced [X] times in the database […AdminContent…].
There are many suggested solutions to this problem on the internet (Accessing search administration, Querying the database, setup SharePoint Foundation Help Search and crawl help files)
What worked for me was accessing these search pages in the help-site-collection in Central Administration. (just ignore the error about missing list).
After that just reanalyze the issue in the Health Analyzer and hopefully it will dissapear.