Is there a multi cryptocoin wallet cleint or service? I'm asking because I'm using the www.multipool.us pool and I would like a central client to store the coins. 
I was worried about the same thing just like you when i was a newbie in mining .But there is no such wallet that can serve you as multi cryptocoin wallet.I directly use the deposit address of yobit.net or poloniex.com (if the coin am mining is not listed on yobit) and i suggest you to do the same.It is very annoying to keep up so many wallets in PC and syncronize it to show up balance ,so i think using exchange's deposit address is the best.