In Photoshop certain filters, applied to an image that has a pixel size which is a multiple of 512, are naturally seamless. This is a good thing to remember, as it will save time and headaches while building texture tiles. JPGs are evil ... if you must use them because of size constraints, I suggest using Photoshop's save-to-web or Imageready, as they use different algorithms and compreess much smaller and cleaner than any other option. Poser4 does not tile textures unless the model has been UVmapped to do so. In Poser5 it is possible to use a tiling image as a shader compoenent