iTunes Memory Hog

yesterday i upgraded to iTunes 7 as soon as it was released. my computer was running pretty sluggish. today i checked the memory usage on iTunes and it is a staggering 612,484 mb. i thought it may be a memory leak, so i closed iTunes, opened it again, and sure enough, it went right back up after scrolling through some of my albums. it does not go back down at all. with iTunes 6, it would typically use 30-40 mb. also, when i use the "cover flow" feature, i get these diagonal lines going thru all the cover art. is anyone else experiencing these same problems?