An example of my problem is at http://techfests.com/NWA/2012/Tracks/Cloud/default.aspx. Notice how the word "Microsoft's" is rendered as "Microsoft?s".
I input this in the Text Editor on the web part, and have tried plain typing, and cut and paste in Plain Text. The problem must assuredly be with Sharepoint because the problem is persistent across all major browsers. However, I mostly use Chrome to do my work in Sharepoint because I use a Mac.
How can I overcome this problem of HTML tags showing up in content?