The Tredici version of Silca's Italian Army Knife Tool for bicycles offers 13 tools for roadside repairs in an incredibly compact package. Incredibly well-thought-out and designed, right down to the tools, which are forged (rather than bent), allowing them to fit in half the space.
Each tool is mid-length: long enough to reach recessed bolts, short enough to resist twisting. Each tool is forged and double chromed, while fully stainless steel hardware and bushing prevent corrosion.
There's even a magnetic "pocket" to store your spare chain master link!