Following is the small list of equipment I tend to carry wherever I go.
The rucksack holding them all is a Cobra LO9B Camera Bag.

Digital Camera body - the trustworthy container of all my pictures:

Canon 30D

Lenses - where should one be without them:

Canon EF 28-90mm 1:4-5.6 Mk II Zoom Lens
Canon EFS 18-55mm 1:3.5-5.6 Mk II Zoom Lens
Canon EF 50mm 1:1.8 Mk II Prime Lens
Tamron AF 70-300mm 1:4-5.6 LD Tele-Macro (1:2)
(All lenses are equipped with UV filters and hoods)

Tripod - for the eversteady output when needed:

Giottos VT-806

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)