DNASkittle is a web based genome browser that provides an interactive visualization of the raw sequence. Every nucleotide of 10Kbp can fit on one screen at a time. It makes heavy use of signal processing techniques to extract tandem repeats, and other genome elements.
Check out this link for some starter reading.
http://blog.mikecouturier.com/2011/07/create-zoomable-images-using-google.html