Yes. Danlec already created a bookmarklet that lets you create Trello card from many services like Fogbugz, JIRA, Github and more. I forked his code and included the functionality to create card with salesforce case information.
- It allows you to create a card with Case Subject and description from case record.
- If there is a recent comment (at least one comment) it will ignore the case description and copy the recent comment for card description.