It seems naruto chapter 263 (volume 30) was the last chapter covered in the naruto shipuuden's 18th episode. So if you want to catch up with the manga start with reading ch264 (still volume 30).
I also think that last episode had very little to offer, it still probably covered 2chapters as it does most of the time but this time it was the episode title "button hook entry" if I recall correct. Original title (takes up a few frames in chapter 262 or 263 of the manga) but it made me think: "Ah jeez, is that all we're gonna see today ^^".
Well but maybe a slow progress is better than moving to fast and end up having to input fillers again!