HTC STATUS-INTERNAL MEMORY LOW EVEN WITH SD-CARD?
The sdcard is not included with internal memory. What it is actually complaining about is the location where the data and apps are stored (/data &amp; /data/data) and could also include the cache (/cache). I have been saying for a while that more space needs to be allocated for these locations. 

I have to go through and remove some apps some times, and even go to apps like Google+ and "clear data". Google+ is actually a good example of a data hog. I had to clear it today. Google+ was using 42MB of storage. 

The best thing that I can suggest is to clear the data on apps that are "hogs" or remove apps that you don't use.