Canon Digital SLR with Sigma 15mm wide angle lens.
Manfrotto 303 SPH VR Tripod Head, MN 338 Levelling unit and Manfrotto MN 055PROB Tripod.
Technique: 8 shots at horizon, 8 shots at 45º above, 8 shots at 45º below, plus one shot directly overhead for ceiling.

Each individual image photographed at: 1536 x 1024 pixels image size.

Time to shoot: 5 minutes for 25 images.
Stitched with Real VIZ Stitcher on Mac OSX.
Stitching: approx 10 minutes.

TIPS:
Get your NODAL POINT as correct as possible for both left and right and up and down movement of the head.

In Real VIZ Stitcher 5.0 you can use the 'Auto Stitch' feature to stitch the images for you while you have a coffee (and do the washing up!!).

The above image had had NO artefacts retouched or removed in Photoshop, only a slight level adjustment and a touch of sharpening.