http://blogs.msdn.com/b/dotnet/archive/2009/06/19/tail-call-improvements-in-net-framework-4.aspxGrant Richins has a post on the CLR Code Generation team blog that covers the work done to improve the x64 JIT to honor the "tail." instruction prefix, thereby making functional languages like F# more viable. You can find the full post here .en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/dotnet/archive/2009/06/19/tail-call-improvements-in-net-framework-4.aspx#9792366Sat, 20 Jun 2009 02:22:35 GMT91d46819-8472-40ad-a661-2c78acb4018c:9792366infoblog &raquo; Tail Call Improvements in .Net Framework 4<p>PingBack from <a rel="nofollow" target="_new" href="http://blog.a-foton.ru/index.php/2009/06/20/tail-call-improvements-in-net-framework-4/">http://blog.a-foton.ru/index.php/2009/06/20/tail-call-improvements-in-net-framework-4/</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=9792366" width="1" height="1">