BeagleBoard

Hardware

The Beagle Board is a low-cost, fan-less single-board computer based on TI's OMAP3 device family, with all of the expandability of today's desktop machines, but without the bulk, expense, or noise (from beagleboard.org). It uses a TI OMAP3530 processor (ARM Cortex-A8 superscalar core ~600MHz paired with a TMS320C64x+ DSP ~430MHz and an Imagination SGX 2D/3D graphics processor). See OMAP3530 features for more processor features. Price is USD 149. The design goal was to make it as simple and cheap as possible, e.g. not having a LCD added, but letting you connect all add-ons available as cheap external components. See What is Beagle? and LinuxDevices article for more details.
The videos Beagle Board Beginnings and Beagle Board 3D, Angstrom, and Ubuntu give you a good intro about what BeagleBoard is about and its capabilities.

Components

Top view of rev B:	Top view of rev C:

No.	Name	Comment
1	OMAP3530 processor + 256MB NAND + 128MB DDR (rev B) + 256MB DDR (rev C)	PoP: Package-On-Package implementation for Memory Stacking 256MB NAND/128MB Mobile DDR SDRAM available from DigiKey (512MB NAND/256MB Mobile DDR SDRAM available from DigiKey) Micron's multi chip packages (MCPs) for Beagle Board
2	DVI chip (TFP410)
3	DVI-D	Connection via HDMI connector
4	14-pin JTAG	1.8V only!
5	Expansion connector: I2C, I2S, SPI, MMC/SD	User must solder desired header into place
6	User button	Allows setting boot order.
7	Reset button
8	USB 2.0 EHCI HS	Rev A and B: not working, unpopulated Rev C: populated and working
9	SD/MMC+	SDHC cards are supported
10	RS-232 serial
11	Alternate power	normally powered by USB (unmounted on REV Ax boards, see errata)
12	USB 2.0 HS OTG	Mini-AB connector. Board can be powered from port.
13	Stereo In
14	Stereo Out
15	S-Video
16	TWL4030 (Rev A thru C2 inc.) TPS65950 (Rev C3 onwards)	Audio CODEC, USB port, power-on reset and power management. The TWL4030 is pin-compatible with the TPS65950 chip and was used due to the very limited availability of the TPS65950 in early board revisions.
17	LCD	only rev C
18	USB power
19	Host PHY
20	32kHz
21	12MHz
22	RS232 XVCR
23	PWR SW
24	VBAT

• Board size: 3" x 3" (about 76.2 x 76.2 mm)
• Weight: ~37g
• Currently 6 layer PCB; target: 4 layer

Bottom of rev B:

See jadonk's photostream for some more detailed BeagleBoard pictures.