Portable applications recommend:
Portableapps -- Convenient , open source ,free , fast ★★★★★
Ceedo --Convenient , Free Trial, more software supporteded ★★★★
Mojopac -- Convenient , free version and Deluxe version ,powerful software supported ,but long time boot ★★★★
U3 smart drive -- Convenient , but must buy their USB drive ★★★
Prayaya v3 -- Easy to use , free series NO. , more software supported , fast ★★★★★
List of portable software
http://en.wikipedia.org/wiki/List_of_portable_software