I think the answer depends on what your product and target market is. If your product is designed for technical-users, it's likely that most of them have alrea

I think the answer depends on what your product and target market is. If your product is designed for technical-users, it's likely that most of them have already migrated to Leopard, making the headache of ensuring support for Tiger likely not worth it. If your product is designed for non-technical users, the headache of remaining backwards-compatible is probably worth it based on the vast number of folks who don't upgrade until they buy a new computer with a new OS pre-installed.