It's the yeast from Anchor Steam. If that's the style of beer you're looking for, it's fantastic--that's one of my favorite beer styles, so I use it once every 8 brew days or so.
Wyeast and White Labs yeasts are both generally very good matches for the style they claim to be.
On deck: Little Bo Pils, Bretta Off Dead (Brett pale)
Secondary: Oude Bruin, Red Sky at Morning (Sour brown ale)
On tap: Saison Duphunk (sour), Amarillo Slim (IPA), Earl White (ginger/bergamot wit)
Bottled: Number 8 (Belgian Strong Dark Ale), Eternale (Barleywine), Ancho Villa (Ancho/pasilla/chocolate/cinnamon RIS), Oak smoked porter (1/2 maple bourbon oaked, 1/2 apple brandy oaked)