For my day to day work, i use a portable version of the good old Macromedia Dreamweaver 8.0.2. It was prepared with VMWare ThinApp 4.0.0.200 (formerly Thinstall) and includes all of the program's features (including the Extension Manager). It's light (only 86 MB unpacked), it's fast and efficient, and it doesn't require lots of memory. 
Just download, extract to the directory of your choice and off you go !