A guy who used
sha256 of poem written in exotic language as private key lost his brainwallet recently, so yeah you could make your own dictionary, maybe someone thinks that nobody will think about using password directly as key or MD5 of passwd and you will be the one who will teach him a lesson about security practices. Be creative in choosing which keys to check and you might hit big. Of course properly generated private keys are safe (well until you use them with
bad RNG).
Brute-Force Concept #2
1. Create website that allows anonymous visitor to enter public key of target wallet (suggestions include suspected Satoshi address, FBI address, etc.) and public key of their "payout" wallet.
2. Visitor presses button to make 100,000 attempts to brute force the target wallet.
3. Visitor enjoys an advertisement while they wait for 10 seconds or so while the attempt is made.
4. If successful, coins are transferred to payout wallet, site shows garish WINNER!!! banner.
5. If not successful, site loads a new ad and invites the visitor to try again.
6. Site operator pays 10% of weekly ad revenue to wormbog for sharing this brilliant technique for extracting money from gamblers who suck at math.
That could actually work quite well. Or at step 2 propose something to be added to dictionary.