No, there is no limit to the number of items that can be contained on the media tab. However, image files can be rather large. If the items are embedded on the Media tab as opposed to being linked, you may hit the maximum database size rather quickly, especially if using MSDE. (The database file may not exceed 2 gig when using MSDE and 4 gig when using SQL Express.) Therefore, if you are adding many items to the Media tab, we recommend linking to the media object rather than embedding.