I just finished updating My fTelnet with a few changes.
First, and most importantly, I finally implemented the ability to add your own entries to the address book. Previously you were limited to my default entries, which was kind of pointless!
Second, I've moved the client connection out of the main window and into a popup window (or new tab, depending on your browser settings). This makes it so you can load multiple connections at once, and also simplifies my life because I can re-use the work I put into the embedded version of fTelnet.