Yes, there are limits to the total number of lists and cards on a board (along with other things such as number of members, checklists, labels). These limits may vary depending on your type of account and other factors that are at Trello's discretion. Typical values are:
(Note I'm not an employee of Trello, and thus this is not official information. These limits are subject to change. Trello does warn when a board is about to reach some limits.)
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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