Still at the top of the tree are SRAMS for mobile phones. They act as Non volatile and cheap alternatives to flash and are now about 16Mb-64MB. They are often packaged with Flash memories (same package) for mobile applications. These are typiclally conventional 6T SRAM devices with leakages << 1pA per cell.
Very few other applications enforce such strict leakage requirements.
Note that for a given technology, say 100nm, the low leakage transistor is about a generation behind ~130nm (or 180nm tech, using 200nm transistors in critical path)