When your assets are distributed among different services, tracking it all becomes an issue.
Posted the question to Quora, copy-pasted here for convenience:
Is there a good solution for tracking your balance across multiple wallets/services?
E.g. it should cover multiple different wallets (blockchain.info, offline wallet, std client), exchanges (Mt. Gox), various investments on GLBSE, interest-bearing bonds...
Naturally, the solution is not expected to integrate with these services, but rather to provide the user with the correct framework to manage his balances. It should support at least BTC & USD balances.
I'm currently using a Google Doc for this, but it's a bit lame and error prone, so I'm looking for something more dedicated.