I notice that two good open source .NET math projects, dnAnalytics and Iridium, are in the process of merging into one combined project, called Math.NET Numerics. Great to see some consolidation and alignment here.
If you're interested in open source math on .NET, this looks like a good opportunity to get involved. There is good F# expertise on this combined team, including Juergen van Gael, and I'm sure contributors looking to work on the these libraries from the F# persepctive will be welcome.
[ Note: there are other great math products on .NET, both open source and commercial - if you'd like me to blog about one, please let me know ]