Following is the small list of equipment I tend to carry wherever I go:
The bags holding them all are a Cobra LO9B Camera Bag, a Paget SY 4531 Camera Backpack or, in case I need to travel small, a Lowepro Nova 160 AW camera bag containing the lenses and a brandless "bodybag".

Digital Camera body - the trustworthy container of all my pictures:
Canon 30D
The camera is additionally equiped with a Canon BG-E2N Battery Grip

Lenses - where should one be without them:
Canon EF 28-90mm 1:4-5.6 Mk II
Canon EF 50mm 1:1.8 Mk II
Canon EFS 18-55mm 1:3.5-5.6 Mk II
Tamron AF 70-300mm 1:4-5.6 LD Tele-Macro (1:2)
(All lenses are equipped with UV filters and hoods)

Flash - to provide light in the dark places:
Braun 370BVC

Memorycards - one could never have enough of those:

Apacer Photo Sieno III Pro 1GB (15MB/sec)
Sandisk Extreme III 2GB (20MB/sec)
Sandisk Extreme III 8GB (30MB/sec)

Miscellaneous - Other things that are very useful:

Massa MS-A Canon Shutter Remote Control