One of the most common questions I get is what are the differences between VSTO 2005 and VSTO 2005 SE. This can be a little confusing because of the way that the 2 products overlap and the fact that there are 2 versions of Office (2003 and 2007) involved. On kathleen's blog she has created a video which gives the clearest explanation of the 2 products that I have seen.
VSTO 2005 vs VSTO 2005 SE Video Training
Look for more VSTO for Mere Mortal videos soon and be sure to grab a copy of our book.