Many mods, such as the CoFH mods or Chickenbones' mods require a later version of forge.
And if you upgrade now, guess what you get?
...
SPINNY ANVIL THING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
No really:
It also comes with a progress bar so you don't have to stare at the log. What more can you ask for? (Beside Modloader support)