if your looking to find something to monitor temps your gonna run into having to use a few different apps all at once cause nobody has really written much in that area cause it really isnt needed
hdparm will show hard drive temps if the hard drive has that capablity
as far as CPU temp and stuff like that, dont know.......basically the same issue as benchmark apps, they exist, but not like with windows because they just arent needed.........
whats funny is lots of apps cross over from linux to windows, but not the other way....for example many of the video encoding apps in windows use linux apps compiled in minGW to run on windows because the windows apps suck....ffmpeg,lavc codec, mencoder, etc etc are all from linux, you will find them as dll's or exe's in windows apps all the time
linux isnt usually used for gaming or overclocking either so you wont see many graphic benchmark apps or temp monitors