Portable version of the free image writing utility ImgBurn
ImgBurn carries on from where DVD Decrypter left off!
ImgBurn can write most types of CD / DVD images and it supports all the latest writers (including booktype / bitsetting on many of the major ones - i.e. BenQ, LiteOn, NEC, Plextor, Sony). You can even use ImgBurn to erase / format your rewritable media!
ImgBurn will do its very best to burn DVD-Video double layer images using the layer break you've specified in the IFO files, but also calculates the best place for you saving you the trouble.
Advanced functionality can be found in context menus that appear when you right click on various bits of the user interface.