I use only Canon equipment for all of my professional photography work.  Nikon is also very good, in case you are wondering, but I married into the Canon family long ago when I thought Canons managed noise better and there I shall stay. 

PRIMARY CAMERA - Canon Digital Rebel Xti

10 megapixel dSLR
CMOS sensor, 1.6x crop factor
Unsealed body, but protected by aftermarket rubber "camera armor"
rated for 50,000 shutter actuations
I've taken about 19,000 images with it since January 2008

LENSES

Canon EF 16-35mm f/2.8 L-series wide-angle zoom lens (this is my "walk-around" lens)
Canon EF 50 mm f/1.8 prime lens (known as the "nifty fifty" and used mostly for portrait work)
Canon EF 100 mm f/2.8 prime macro lens (great for close-ups and zooming in on a distant subject)

DIGITAL COMPUTER LAB

custom-built Athlon 64 3500+ high-speed computer with XP Professional
2 GB of high-speed, low latency Corsair Twinx memory
74 GB 10,000 RPM Western Digital Raptor high-speed hard drive
300 GB and 160 GB backup drives
512 mb NVIDIA GeForce 7950 GT
30-inch Dell LCD monitor
DVD and jump drive technology
Adobe Photoshop CS2
Canon i9100 professional large-format inkjet printer

High-end Toshiba laptop for onsite production work
Canon Pixma IP3500 for onsite printing work

OTHER STUFF

Professional canvas backdrop for portraits with aluminum stands
Two free-standing umbrella light kits
High-end professional tripod