Q:

Can a Sorcerer learn "Cure Light Wounds" from a scroll?

According to the book, the sorcerer can learn an unusual spell from a scroll if the spell is Arcane. A Bard can use Arcane spells, and the "Cure Light Wounds" is available on his magic table.
So if I am a sorcerer and found a "Cure Light Wounds" scroll, would I be able to learn it as an unusual spell?
My question is because on page 64(Players book) there is this situation:

For example, a sorcerer with a scroll or spellbook detailing an 
  unusual sorcerer/wizard spell (one not on the sorcerer/wizard spell 
  list in this book) could select that spell as one of his new spells for 
  attaining a new level, provided that it is of the right spell level. The 
  sorcerer can’t use this method of spell acquisition to learn spells at a 
  faster rate, however

A:

Only If Sources Beyond the Player's Handbook Are Used
Omitted from the online sorcerer description is the following from the Player's Handbook:

[The sorcerer's] new spells can be common spells chosen from the sorcerer/wizard spell list (page 192), or they can be unusual spells that the sorcerer has gained some understanding of by study. For example, a sorcerer with a scroll or spellbook detailing an unusual sorcerer/wizard spell (one not on the sorcerer/wizard spell list in this book) could select that spell as one of his new spells for attaining a new level, provided that it is of the right spell level. (54)

Emphasis mine. Using a very hard reading of the rules as written, if the DM determines the sorcerer can gain "some understanding of [the spell cure light wounds [conj] (PH 215-6)] by study" from the scroll and the spell cure light wounds appears on the Sor/Wiz spell list in another source other than the PH, the sorcerer can add it to his spells known.
As the above is largely campaign-dependent, it needn't be a scroll. The DM determines what exactly the sorcerer can study to gain this understanding (e.g. ancient dragon scales possessing the secrets of weird magic, the corpses of magical minions, the drippings of sacred candles).
I am, however, unfamiliar with a published setting or source that adds cure spells specifically and directly to the Sor/Wiz spell list.
However, another source can totally be the DM's campaign notes. Thus, in a campaign that amends the Sor/Wiz spell list, the sorcerer could, upon understanding the spell via study, select that spell as a new spell when he reaches the next level if the spell's on the Sor/Wiz list at the appropriate level.
The DM should look askance at a player who claims his authorship of another source on a  cocktail napkin amends his character's spell list, unless the source is accompanied by an appropriate bribe.

A:

Rules:

To have any chance of activating a scroll spell, the scroll user must
  meet the following requirements.

The spell must be of the correct type (arcane or divine). Arcane spellcasters (wizards, sorcerers, and bards) can only use scrolls
  containing arcane spells, and divine spellcasters (clerics, druids,
  paladins, and rangers) can only use scrolls containing divine spells.
  (The type of scroll a character creates is also determined by his or
  her class.)
The user must have the spell on his or her class list.
The user must have the requisite ability score.

So the answer is no, since the Sorcerer does not have that spell on his class spell list.

The sorcerer can learn spells on his class spell list through expensive magical research if he wants to learn more spells than those he has taken due to level ups, but can never learn spells not on his class spell list.

A:

Not normally, because it is not on the Sorcerer/Wizard class list. Bards do indeed cast the spell as arcane, but that's not enough: spells are also broken down by class, not just by type.
If the sorcerer can somehow add the spell to his class list, that changes things. There are a few effects that could be used to do this, like the Wyrm Wizard prestige class from Dragon Magic. But these effects also tend to teach you the spell, which renders the point moot: the sorcerer still can't learn the spell from the scroll, because he already knows it.

