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Yes, this absolutely should be checked, because if the dalvik cache is in internal that's a big drain.I think only the apk files are sitting in ext partition. Dalvik cache is still in internal memory.
Moving this should free up some 60-70MB space.
I'm not sure how this is done with that Sense ROM, so check that specifically there.
57?? I have 125, including 4 Angry Birds apps (I still have the original beta on there) and am using significantly less space.
Using Quick System Info, select Applications -> All, then in preferences (near the bottom) get it to sort them by size (data size might be more useful than total size for this). That way you can see whether there are any that are using huge amounts of space.
Yes, this absolutely should be checked, because if the dalvik cache is in internal that's a big drain.
But if the dalvik is not on ext, what is using 260MB with 57 apps? If it's just apks that would be an average of 4.5MB/app, which is why I suspect that the dalvik might have been moved.
DC E1G: good catch!

Try the following commands in a terminal emulator:
su
cd /data/dalvik-cache
pwd
On mine the third command returns the result "/sd-ext/dalvik-cache"
Edit: or if you have Root Explorer, just look at /sd-ext and see whether there's a dalvik directory in there.

And theres not one in /sd-ext? What about in /data?
