Microsoft's .NET CF Team have posted a huge (both in quality and quantity)
performance and working set FAQ on Version 2.0 of the .NET Compact Framework. This should be a great resource for all you developers looking to create some great .NET-based mobile applications once v2.0 goes live. Speaking of 'live', this is a live document and will be updated as required. Nevertheless, there's oodles of information packed into this document, so it should make excellent bedtime reading material!