How do you bookkeep?

[gravy_train]

I track everything on excel spreadsheets. I have categories for groceries, office supplies, general supplies (toys, crafts, etc), furniture and repairs.
I claim 50% of my grocery bill and 100% of the other items.
I organize my columns by month, then enter each expense and have formatted the columns to add everything automatically. I also have a payments received spreadsheet for tracking when I get paid, individualized per client. I write down the amount, cheque number (or EMT confirmation number), date and any notes (if they picked up late or paid late).
I also photocopy all of my receipts and organize them by month. Then I staple the original to the photocopy and print off my monthly spreadsheet and attach that to the bundle.
The plan was to do this monthly to avoid a big uproar at tax time but of course it didn't happen so I did all of this in two sittings and it took me about 4 hours in total. It might be overkill but I feel really organized now and everything is set up so easy to re-use for this year.