TrueCrypt

You can mount NTFS partitions under Linux with ntfs-3g.

You can mount ext2/3/4 partitions under Windows with ext2fsd (haven't tested write support yet).

There is a bug in version 5.0a, it doesn't pass the –fs-options parameter content to mount as options. You can fix it with this patch (found on TrueCrypt forums):

--- CommandLineInterface.cpp   2008-02-05 19:58:44.000000000 +0100
+++ CommandLineInterface.cpp   2008-02-13 16:15:36.000000000 +0100
@@ -192,6 +192,12 @@
          }
       }
 
+      if (parser.Found (L"fs-options", &str))
+      {
+         ArgMountOptions.FilesystemOptions = wstring (str);
+      }
+
+
       if (parser.Found (L"new-keyfiles", &str))
          ArgNewKeyfiles = ToKeyfileList (str);