Python. The Pygame library is handy for psych experiment programming, as is the pgu GUI library for Pygame. Just started playing with PyQt, another GUI library which looks professional. I miss decent type checking :-(
M$ Excel. Useful for quick manipulation of tables, e.g., adding colours to make effects standout. I find it handy to copy output from R, paste into Excel, and then use Data... Text to columns... to make into a table, e.g., for pasting into a paper. Niki also told me about this handy LaTeX table plugin.
M$ Powerpoint. Necessary evil. Faster than beamer and with a LaTeX plugin. OpenOffice fineish too.
LaTeX (MikTeX on Windows), WinEdt (one of the few shareware programs I've purchased - excellent) and LaTable. It's possible though painful to make posters using beamerposter. Recently Adobe decided to break its Reader program so that it no longer works with WinEdt. The solution: install version 8.1.3 and ensure all PDFs open in the SAME window. I've had enough: now using the excellent TeXnicCenter which does very sensible compiling and sync with the pdf.