Speeding up Samba file copying?

You know how copying large files between a Mac and PC can be so painfully slow? Part of this surely comes from some magical file allocation nonsense translation that occurs between NTFS and HFS, but plenty comes from a little neworking problem. See, according to an anonymous poster at macosxhints, TCP winds up delaying packet acknolegements, which in turn revs Samda down, which means my dang ripped movies don't copy as quickly. Er, I mean those peskly PPT files... At any rate, the tip is to turn off the delay. Sounds easy, but the method is a little scary. I have noticed my mixed-client transfers going faster in Tiger, but I'm too scared to try this one out. Anyone game?