We suggest using Mint, or LemonWallet.

Mint.com
The easiest personal finance app we've seen thus far. Allows you to create custom budgets, get bill reminders and alerts, organize purchases into categorizes and visual charts, sync to your desktop and mobile devices, tight security features, and best of all - it's free! In regards to your shoebox full of receipts? It does not have the capacity to do this yet. However, you can edit the title/description and categorize each expenditure (For example: Bank Statement Charge: 540-897-6000/800-970-DEPOT, Edit to: Home Depot Paint - Living Room. Categorize into "Living Room Remodel" Budget. Tons of great features.

Lemon.com
Your digital wallet. Keeps track of credit cards, coupons, store discount/rewards cards, and receipts. Access anywhere from your desktop to your mobile devices, set budgets/goals, and receive rewards for purchases. Though starting May/June 2013, you now have to automatically enter receipt information, no longer automatic by taking a picture. Free Version and Unlimited Version ($4.99/mo.).

Hope this helps! Happy home improvements!