Does the "Unibody" MacBook have expansion slots?

No. None of the MacBook models provide expansion slots. If a Mac notebook with an ExpressCard/34 expansion slot is a high priority, you will need to purchase a MacBook Pro that is equipped with ExpressCard/34 support. If you need a Mac notebook with an older PC Card slot, you will want to consider PowerBook G4 models with 15" or larger displays.

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Can you upgrade the processor in the "Unibody" MacBook?

No. All MacBook models -- "Unibody" and otherwise -- have the processor soldered to the motherboard. It is not upgradable.

What are the capabilities of the optical drive provided by the "Unibody" MacBook models?

The "Unibody" MacBook models have an 8X slot-loading "SuperDrive" (DVD±R DL/DVD±RW/CD-RW). This drive is capable of reading and writing dual-layer and single-layer DVD as well as CD media.

What type of video processor is provided by the "Unibody" MacBook models? Is it upgradable?

The "Unibody" MacBook models -- the MacBook "Core 2 Duo" 2.0 13" (Unibody) and MacBook "Core 2 Duo" 2.4 13" (Unibody) -- each have a NVIDIA GeForce 9400M graphics processor with 256 MB of DDR3 SDRAM shared with main memory.

Apple additionally reports that "memory available to Mac OS X may vary depending on graphics needs. Minimum graphics memory usage is 256 MB".

Does the "Unibody" MacBook support dual displays? What is the maximum resolution for an external display?

Yes, the "Unibody" MacBook models support dual displays in both "monitor mirroring" (where the contents of the internal display also are displayed on an external display) and in "dual-display" or "extended desktop" (where the external display can be used as additional work space).

The maximum resolution supported on an external display is 2560x1600.