I think sl can be used in a capacity that extends beyond the border of a web interface. The visual and performing arts are already using it to expand their audience and customer base to be worldwide, and while this is something that can be handled via a GUI, it is much more effective in a simulated 3-D format.
As a person who works with folks daily from all around the country and the world, this medium can provide a new method of travel to bridge the physical gaps. While there is television and telephone conferencing today, these are still very 2-dimensional environments. Having a sense of being in a space with another person can contribute to moral and comeraderie in a way that 2 voices on a phone cannot.
I think that if you want to use this as another version of the Internet, you will be uninspired to take the extra steps just to browse. If you want to treat it like what I believe it to be - a blending of the cyber and physical worlds - and use it for more, then I think you'll agree with me that this is the global community of the future.