Bonding in methane
Covers bonding in methane and ethane, including a simple look at hybridisation.
Bonding in ethyne (acetylene)
Looks at the formation of a carbon-carbon triple bond. (If you aren't happy about bonding in ethene, read that first!)
Bonding in carbonyl compounds
Describes the carbon-oxygen double bond in methanal (including a simple look at hybridisation), but applies equally to other aldehydes and ketones like ethanal and propanone.
An introduction to electronegativity as it applies to organic chemistry, including its causes. Bond polarity.