Goobermunch
Explorer
I'd argue that sorceror levels, at the very least stack. The SRD states "Spells: A dragon knows and casts arcane spells as a sorcerer of the level indicated in its variety description, gaining bonus spells for a high Charisma score. Some dragons can also cast spells from the cleric list or cleric domains as arcane spells." Clearly, these are not spell-like abilities (especially since the next entry is "Spell-Like Abilities."
Therefore, when it says they cast spells as a sorceror, I read that to mean that they do so exactly like a sorceror. Since I can't take levels as a Sor 1/Sor 1/Sor 1 (even though I might like to have a variety of familiars), I'd say a young gold dragon (casts as a Sor 1) with two levels of Sorceror would be a Sor 3. That makes the most sense, especially given the link between Draconic Blood and sorcery.
--G
Therefore, when it says they cast spells as a sorceror, I read that to mean that they do so exactly like a sorceror. Since I can't take levels as a Sor 1/Sor 1/Sor 1 (even though I might like to have a variety of familiars), I'd say a young gold dragon (casts as a Sor 1) with two levels of Sorceror would be a Sor 3. That makes the most sense, especially given the link between Draconic Blood and sorcery.
--G