Onward to Xtreams
It looks like Xtreams is getting attention beyond the world of Smalltalk implementations. Derek Williams writes:
Smalltalk is home to perhaps the first truly elegant streams implementation, particularly when compared to other approaches developed around that time, such as those in C and C++. You can’t get much simpler than ‘myfile.txt’ asFilename readStream contents to open and read a file, and yet there’s significant power in the classes behind that. But new designs for stream libraries since followed, including pluggable/chainable I/O stream architectures, such as those found in Java, C#, and even advanced parallel stream processing frameworks. Not to be outdone, Michael Lucas-Smith and Martin Kobetic have recently developed a new pluggable stream framework for Smalltalk called Xtreams, and I couldn’t resist giving it a try.
There's a lot more there; follow the link.