Let me begin by stating that I did google the answers (and I'll reference to them soon). Yet each of the resources I found discussed one particular method, I'm interested in a comparison of the approaches.
So far, I've found three ways to deal with this problem:
split the number into two columns (integer and fractional parts), as documented here or here. The LaTeX code is simple, but the approach is a pain when it comes to copying and pasting tables from external sources.
What do most people use?
dcolumn? Are there other options?