Usually to find apps I download apps reviewed and suggested by android central, and also I sit there in spare time and rummage through the playstore looking for new things to download for the tab.
I usually just find new apps 1) if I have a need, I'll do some searching...or 2) I always keep an eye on a few different RRS feeds from various android sites and there is always posts of new apps, and if it catches my eye I'll give them a try
I use reviews from Android Central, tested.com, and sometimes the Geek Dad blog on Wired. Think it would be great though to have a way of accessing tablet optimized apps and hadn't heard of Tablified Market before.
I always find new apps after reading the android central forums app reviews....everytime u guys review an app I download it and all the time I decide to keep it BC its so good....with the exception of the Batman game....which I kinda hated lol