Danial Payne has posted A Review of an Analog Layout Tool called HiPer DevGen at SemiWiki.com. This tool provides layout for differential pairs, current mirrors, and resistor dividers. It will account for Linear process gradients, Mask misalignment, Implant shadowing, Shallow Trench Isolation (STI), Length of Diffusion (LOD), Lithography invariance, Current flow direction, Antenna effect, Vt shift, snf Well Proximity Effect (WPE). Danial briefly describes competing layout tools and indicates that HiPer DevGen is more cost effective that similar tools on the market. There is a link to a video demo of the tool, but this require registration to view it.