|I find it very helpful to use my PDA (aka Palm pilot, personal data assistant) to keep track of various sewing tasks and/or lists.
Thread inventory- so I don't end up without the right color thread, or buying one I already have
Pattern wish list- when browsing patterns, I make a list of which ones I'd like to buy at the next sale
General shopping list- I delete the items as I pick them up at the store
An 'inches to fractions' conversion chart
My current meaurements
Fabric width conversion chart
Items on sale
Patterns I need to buy for others
Books I'd like to buy/borrow from library
I just keep these lists in the memo pad feature of the PDA. There is also a "to do list" that one could use for upcoming projects.
Spending tracker- make sure you don't get a shock at the end of the month when you find that you've overspent!
Of course, this may not be reason enough to go out and buy a PDA, but if you already have one like I did, this is a good way to get more mileage out of it. I'm also saving paper, and, unlike bits of paper, I will not lose my data, as long as I do regular backups.
Also, there are many sites that offer cheap or free add-on software for your PDA. Though I've yet to find a sewing-related program, if you know a computer-savvy friend, perhaps they could make one for you. (And if they do, let me know!)