SoftMod is a nice mod for SRO that includes a zoomhack as well as multi clienting stuff.
Current version as of this moment is .2a public. You can download it from their forums. Go ahead and sign up on their forums that way you can get the newest version.
In the future there is plans to allow you to miniclient SRO. Which means you can run SRO in a LITTLE tiny window. It looks great. Ive accualy seen it in action. Anyways.. Heres the link
http://www.0x33.org/forum/viewtopic.php?t=594
Ophidian