We just finished creating the absolute ULTIMATE in stairs. It does not get better than this. First of all, we put 28 sculpted stairs on a single prim, which is the maximum that will look good on a conventional 10x10x10 prim. Then we doubled it, putting 56 steps on a single prim, and had to use a megaprim with 16 different standard size configurations to do such!
These stairs are geometrically perfect. They are completely sharp and square. Each step is precisely the same size. They are completely texturable, and include a system to easily custom texture them. Finally, they are the most efficient objects in Second Life: they do what 56 prims would normally do, but using 1/2 the number of polygons that such prims would.
Pictures:
http://img58.imageshack.us/img58/7898/megastairadd1cc5.jpg
http://img530.imageshack.us/img530/3295/megastairadd3tj4.jpg
http://img530.imageshack.us/img530/2606/megastairadd4il0.jpg
Link to In-World store:
http://slurl.com/secondlife/Agrippa/174/45/78
SLEX Listing:
http://slexchange.com/modules.php?name=Marketplace&file=item&ItemID=307747