Now we need some trusted source from where we can download portable software. Take a look.
1. Portableapps.com : Portableapps.com is a great place for best rated portable software collection for your favorite windows. I also use this site. The programs from this site are very friendly and works as real root program. You will get all portable Firefox, Chrome, Google Earth, Team Viewer, etc there.
2. Portableappz.blogspot.com : Portableappz.blogspot.com is another cool place all needful programs. Many times I also use this website. You get a huge programs there. They mainly use server for file hosting.
3. Pendriveapps.com : Pendriveapps.com is another recommended site for you. They serves different kinds of softwares which can be run directly. They uses many for hosting their files.
4. Usbspace.com : Usbspace.com is also serves portable software for windows. But they dont seems to be updated. So I will not recommend you to use this site. They also uses different file servers for serving files.
5. Free-portable-software.blogspot.com : Free-portable-software.blogspot.com is a great for getting many kinds of portable softwares, antiviruses et. This site uses rapidshare for hosting files.You can use this site with no doubt.