Another MaximDL fan... PHD is great for guiding when you're starting out because its free, easy and does the job well. But when you start stretching the focal length out, or just when you want your guiding to be that little bit tighter, PHDs simplicity becomes its Achilles heel, Maxim takes a bit of time to get it all running sweet, but the ability to exert control over every possible facet of the guiding is a real boon for ironing out those little detail smudging hiccups that other programs simply don't provide the ability to compensate for..
CCDSoft is very good also, if you have an SBIG camera.. If you're not running an SBIG imager with an SBIG filterwheel and preferably and SBIG guider (be it internal or remote guide etc) CCDSoft can be a pain in the backside.. (not to mention expensive to get addon packs to support other cameras/cfws/guiders etc..
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