There are multiple processes available to kill this patent (reexamination, post-grant review, inter partes review). However, they are all fairly expensive.
Normally, a patent application is published 18 months after filing, well before the patent is granted. Why do I never read here about attacking silly patents when they are still an application?
About this patent: when I saw the slashdot summary, I hoped that it was a bit exaggerated and that the patent claims actually were much more narrow. But no, the essential part of claim 1 is actually:
A computer-implemented method for formatting a range of cells according to a spectrum of cell formats, .... for each respective value between the minimum value and the maximum value, causing a processor to apply, to the cells of each respective value, a respective cell format ....
In plain English: automatic color-mapping cells based on a range of numeric values corresponding to a range of colors. To me, this sounds rather obvious: I did once search for such a feature in Excel (or was it LibreOffice?) and was irritated that I had to make a verbose list of conditional formatting (if value > 0 and < 1, then green; if value >=1and <2, then cyan, etc.).
But apart from the question of obviousness, which is a bit subjective, I wonder whether the claims cannot be attacked directly for unambiguous prior art. The word 'cell' does not seem to be defined strictly as applying to spreadsheet cells, since the patent summary talks about "cells in spreadsheets, tables, and other computer documents", where the term "document" is not defined. If e.g. MatLab files or finite-element model files can be considered as a special kind of documents, that would immediately invalidate claim 1.
Unfortunately, if you invalidate claim 1, the following claims may still be valid. They treat cases where the numerical value of a cell is not color-coded, but e.g. as little bar or pie charts.