This guy that you are developing for must really like spending money... if he is going to move to asp.net why not do it now? asp 3.0 is very different from asp.net. you will pretty much have to rebuild the entire web application from scratch.
If you can get a copy of SQL Server standard, then I recomend you get rid of MSDE. you can use enterprise manager and SQL analyzer to Graphically manage SQL server (they are both packaged with a standard copy of SQL Server).
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