If you had Sony PSP and wanna use Google Talk directly from your PSP or other Protocol Messenger Services such as AIM, ICQ, MSN / WLM (Windows Live Messenger) or YM / Yahoo Messenger you can use “Away From the Keyboard Instant Messenger” or AFKIM. It also has built in keyboard.

Download AFKIM for Sony PSP

There are few alternative to use Windows Live Messenger on Nexus One (WLM in Android). Two Alternative below are the best ways that I recommended to your.

Use Meebo for Android
Use eBuddy for Android

Meebo and eBuddy are Multi IM Client that can connect to several Messenger Service at one such as Windows Live Messenger, FaceBook Chat, Yahoo Messenger, AIM, ICQ, and much more. That why you can use it to connect to Windows Live Messenger from your Nexus One (Android 2.1 OS)
How to install Windows Live Messenger Client in Nexus …

WebJabber is one of Jabber client that works by using Web Browser. Sometimes it also called Web Base Messenger Client for Jabber. That’s also means WebJabber is Web Base Jabber Client.

Features in Web Jabber
You can use your gtalk account to use web jabber. The features are: emoticons, voice chat, sound notification, file transfer, and many more
Free Download Jabber Client Web Jabber
You can download the  Web Jabber at here or just visit the official site of web jabber at www.webjabber.net. For live test you can visit here.