Opera mini is amazing
Opera mini for mobiles is really an amazing piece of software for java supported mobiles. I installed it in MotoRAZR V3 and was able to browse almost every websites as if in a computer. What we need is a java supporting mobile and a GPRS connection. It works with the help of an intermediate server between the mobile and internet. With it, I was able to check orkut, scrap to friends, check my mails and many more. It has bookmarking facility, key shortcuts, etc. What I felt it lack was download support. Opera mini can be downloaded for free from www.opera.com from computers or mobiles. Opera also provides a full featured mobile browser with much more features.
I also tried IM softwares like gotalkmobile and e-buddy. They also works nicely. These and many other softwares for mobiles can be downloaded from www.getjar.com.