I keep putty and the rest of the putty utilities with me on a usb device but for day to day work I use Poderosa. http://en.poderosa.org/ It is a tabbed SSH client. I usually have 8 or 10 sessions open at any one time. Can do cygwin sessions, telnet and serial as well. Simple to work with keys. includes a simple port forwarding client. Split screens. It is a pretty impressive open source tool I have used for years.