So, what do I like about Android 4.0 (beta)? To be honest, this doesn't seem to be a "must-have" upgrade for the time being (However, I could imagine a few years down the road, new apps won't run on 2.3 anymore. Just like a lot of iOS app these days requires 3.1 or even 4.0 or above.) The browser seems smoother and supports tabbed browsing (it's harder to switch between opened "windows" in the 2.3 browser) In addition, it doesn't require another app to turn on Airplane mode like 2.3. It is part of the "Settings"
The biggest problem with this beta upgrade though, is that it doesn't include the Market (where we download Apps) The closest "replacement" for the Market is freewarelovers.com. I found quite a few APK (App installer files. Simply double click in File Manager and it will install the corresponding app) I got other APK by Googling. And here is what I have installed:
-Youtube
-Chinese News Online
-PalmBookReader: 直讀中文(cBook) for some reason doesn't work even though I found its APK. This is its replacement.
-Amazon Kindle
-Rhapsody: it is the official app for the music streaming service. At first, playback always fails after playing a few seconds of each track and will skip to the next one. The problem kinda went away after I checked the box Advanced Settings->Disable track pre-loading
-Pandora
-GoKeyboard: this is the input method that replaced "Baidu input" that came with the tablet originally on 2.3. Not an exact replacement though because it uses Cangjie (倉頡) instead of hand writing recognition.
-XiiaLive Lite
-Facebook
Hopefully Teclast will release an "official" non-beta Android 4.0 upgrade that includes the Market in the near future. In the mean time, I'll keep using the beta (unless there's an app I need so bad that I have to revert back to 2.3, which could be done by downloading the firmware from Teclast)