[EVO 4G Android Development] smelkus:
Yes, that's a part of the temp files wipe, which is from Calkulin's Temp Files cleaner script. It wipes a whole assortment of files:

void wipe_temp_files()
{
ensure_root_path_mounted("DATA:");
ensure_root_path_mounted("SDCARD:");
__system("rm -r /data/agent");
__system("rm -r /data/anr");
__system("rm -r /data/app-cache");
__system("rm -r /data/backup");
__system("rm -r /data/boot-cache");
__system("rm -r /data/data/com.android.browser/app_databases");
__system("rm /data/data/com.android.browser/app_geolocation/CachedPosition.db");
__system("rm -r /data/data/com.android.browser/app_icons");
__system("rm -r /data/data/com.android.email/cache");
__system("rm -r /data/data/com.android.htccontacts/cache");
__system("rm /data/data/com.android.htccontacts/databases/webviewCache.db");
__system("rm -r /data/data/com.android.mms/cache");
__system("rm /data/data/com.android.mms/bufferFileForMms");
__system("rm -r /data/data/com.android.vending/cache");
__system("rm -r /data/data/com.androidapps.spare_parts/cache");
__system("rm /data/data/com.androidapps.spare_parts/databases/webviewCache.db");
__system("rm -r /data/data/com.dataviz.docstogo/cache");
__system("rm /data/data/com.dataviz.docstogo/databases/webviewCache.db");
__system("rm -r /data/data/com.ebay.mobile/cache");
__system("rm -r /data/data/com.estrongs.android.pop/app_.apps");
__system("rm -r /data/data/com.facebook.katana/cache");
__system("rm -r /data/data/com.fring/cache");
__system("rm -r /data/data/com.fring/files");
__system("rm -r /data/data/com.google.android.apps.gtalkservice/files/sslcache");
__system("rm -r /data/data/com.google.android.apps.maps/cache");
__system("rm /data/data/com.google.android.apps.maps/databases/webviewCache.db");
__system("rm -r /data/data/com.google.android.apps.providers.gmail/files/sslcache");
__system("rm -r /data/data/com.google.android.apps.providers.subscribedfeeds/files/sslcache");
__system("rm -r /data/data/com.google.android.location/files");
__system("rm -r /data/data/com.htc.album/cache");
__system("rm -r /data/data/com.htc.friendstream/cache");
__system("rm -r /data/data/com.htc.launcher/cache");
__system("rm -r /data/data/com.htc.socialnetwork.facebook/cache");
__system("rm -r /data/data/com.ihopethisworks.quickhulu/cache");
__system("rm -r /data/data/com.noshufou.android.su/cache");
__system("rm -r /data/data/com.pandora.android/cache");
__system("rm -r /data/data/spinninghead.talkingstopwatchlite/cache");
__system("rm /data/data/spinninghead.talkingstopwatchlite/databases/webviewCache.db");
__system("rm -r /data/dontpanic");
__system("rm -r /data/local/tmp");
__system("rm -r /data/lost+found");
__system("rm -r /data/misc/agent_htc");
__system("rm -r /data/misc/wimax");
__system("rm -r /data/system/dropbox");
__system("rm -r /data/system/throttle");
__system("rm -r /data/system/usagestats");
__system("rm /data/system/batterystats.bin");
__system("rm /data/system/uiderrors.txt");
__system("rm -r /data/tombstones");
__system("rm -r /data/wimax");
__system("rm -r /sdcard/.adobe-digital-editions");
__system("rm -r /sdcard/.android_secure");
__system("rm -r /sdcard/.bookmark_thumb1");
__system("rm -r /sdcard/.easc");
__system("rm -r /sdcard/.estrongs");
__system("rm -r /sdcard/.footprints");
__system("rm -r /sdcard/.htcnews");
__system("rm -r /sdcard/.Mail");
__system("rm -r /sdcard/albumthumbs");
__system("rm -r /sdcard/amazonmp3");
__system("rm -r /sdcard/Android");
__system("rm -r /sdcard/DCIM/.thumbnails");
__system("rm -r /sdcard/LOST.DIR");
__system("rm -r /sdcard/qik");
__system("rm -r /sdcard/Removed_Apps");
__system("rm -r /sdcard/rosie_scroll");
__system("rm -r /sdcard/rssreader");
__system("rm -r /sdcard/tmp");
// ensure_root_path_unmounted("SDCARD:");
ensure_root_path_unmounted("DATA:");
}