my blog lives here now
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  1. \node (a) at (-1, 0) {a};
  2. \node (b) at (1, 0) {b};
  3. \draw[->] (a) to[out=30,in=150] node[midway] (f) {f} (b);
  4. \draw[->] (a) to[out=-30,in=-150] node[midway,below] (g) {g} (b);
  5. \draw[double,->] ([yshift=-2pt]f.south) -- node[midway,right] {$\alpha$} ([yshift=2pt]g.north);