What do you use for your accounts??

I find that there's nothing better than MS Excel when you want to track product & produce reports for your business.

Do you also use MS Excel to work out your profit?

I use it to track all sorts of very specific info. Not just matters of ROI, I track shipment status and other info in regards to client performance as well. The great thing about Excel is that, with a few formulas, you can make a program that does everything you want, nothing you don't, and stuff that can't be found anywhere else.