YES: MS SQL 7.0 on a laptop (Score 2)

On a laptop, use Microsoft MSDE (Microsoft Data Engine). I think this is a nearly full-featured SQL Server 7.0 engine without the scalability. The APIs used for MSDE are the same as for SQL Server 7.0. The product is free, too (download at MSDN site). I guess the intent is to have developers use MSDE for prototyping and small deployments. Customers will upgrade to full SQL Server once their application demands it. Perhaps MSDE will be part of the standard NT distribution soon.