This guy's gadgets are awesome - though one or two features don't work for me (could be that the GPU gadget requires rivatuner or something to display GPU core speed, for example) and can show temp graphs if you run coretemp too.
EVGA Precision will do the same job as MSI Afterburner, but I think the latter might have more features - I haven't used it for a while. Precision can show many graphs, I use it mainly for the fps graph, but it does overclocking the GPU too.
http://www.myfavoritegadgets.info/
Here's the corner of my desktop, with GPUZ and CPUZ running as well:
e: I should point out that I've been changing the clocks/HT settings a bit since I entered my sig on 1c forums.