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You certainly can still use it for normal photography. There's a couple of different types of mods. One is to replace the stock UV/IR filter with a wider spectrum one that allows more IR wavelengths through, another is to just replace the stock filter with clear glass (I have this mod), and the final one I've heard of it to just remove the stock filter and not replace it at all.
I wasn't comfortable with having no filter on my sensor. Helps protect it from dust/damage and also the replacement filters should be the same thickness as the stock one and (supposedly) don't affect autofocus. I think if you remove the filter altogether you'll lose autofocus or at the very least the autofocus will be out.
I got my camera body recalibrated after modding anyway because it was front focusing.
There will be a shift towards red in your shots after modding. There's a couple of options to correct this. One is to get a filter that either screws on to the front of your lenses, or you can get one that clips into the body of your camera behind the lenses (only for crop cameras). These filters (supposedly) do the same job as the filter that was removed. My experience was that they just weren't quite right and colours still seemed a little off.
The other option is just to do a custom white balance for all your shots. Sounds painful but after doing it for a while you get used to what settings you need to tweak to get the colours right.
Hope that helps. There are some websites around, but will have to check for them later if someone doesn't post them in the meantime.
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