Which digital camera,SLR or regular?

SLR single lens reflex
regular such as canon powershot etc

Definitely an SLR if you are a serious amateur and have the money.
An SLR will show you the exact picture you are taking by a reflex mirror that allows you to see through the lens. No more cut off heads etc. You can add or change lenses. The SLR passive auto focusing allows you to get a much sharper photo which especially shows up when enlarging. The SLR gives you manual over-ride for greater creativity. This allows you to learn and understand the workings of photography such as aperture-shutter speed relationship as well as to shoot fully automatically. And many other features.
Also an SLR will get you greater respect from your subject as a serious photographer as opposed to someone who just wants a camera that looks cool and won't inconvenience him with bulk or weight.
A Canon Rebel XTI would be an excellent camera to start with.

bad question.

Give us a clue. What do you want to photograph? What is your budget? Are you going to print your images, display them on a web page or something else?

depends on what you want to do. if you want to have full control of your shots, specially the exposures, slr does it. Though you have to master the trick for some time. Most pro-sumer cameras like canon s3 IS also do the trick comparably but easier to use.

regular

Something tells me when asking a question like this you just may not want to buy different lenses for different situations, nor want to be in complete control of each shot. Complete control such as setting apertures and shutter speeds rather than leave it on automatic. BUT if you want to really get involved with each shot you take, and use manual control settings, then a DSLR is for you. If not, go with the point and shoot cameras which can give very excellent results and some have manual settings if you like.

I'm going to have to say SLR. Brilliant question by the way. Got me two easy points lol.

hands down gotta be SLR because of being able to get really creative on taking photos. plus having so much more accessories to choose from. serious armatures to professional do chose the SLR because of the versatility they do have especially the large assortment of lenses.