MacFUSE is great. I wrote a short bit on it for TidBITS. The elevator pitch is: MacFUSE allows mounting SFTP servers just like AFP/SMB/NFS shares, read-write access to NTFS filesystems (Tiger's built-in NTFS access is read-only), and a whole passel of other filesystem options.

The article, "MacFUSE Explodes Options for Mac File Systems" is at: http://db.tidbits.com/article/8835.

There is a binary installer for the NTFS-3g module (ideal for Boot Camp users), but it doesn't yet have a stable home. Currently, you must visit the macfuse-devel mailing list http://groups.google.com/group/macfuse-devel and look for a posting with the latest URL (as of today, see http://groups.google.com/group/macfuse-devel/browse_thread/thread/ee1c4555d3c90f4f).