Dearleader from the Boulderfist server writes about a topic that hits close to hoe in th WoW forums. Like him, I'm also sentimental about my WoW stuff. I like keeping certain things that mean a lot to me. In fact I still have the three pieces of T1 gear I used to wear before TBC came out. Yes, I still have my Arcanist crown, belt and boots and also my Robe of the Archmage. Wouldn't it be cool to have more space to store these stuff? But this isn't just a matter of storing your old stuff that you can't get rid off. It's about storing more of any kind of stuff.
In the same thread, Bornakk the Blizzard poster gave us some hope about this matter.
There is a possibility of adding more space to characters in the future, but we have not finalized any decisions on this. I keep the items that mean the most to me on my characters, but I definitely don’t keep everything as there comes a time to move on.
Also with the implementation of Guild Banks in patch 2.3, this should help free up some space regarding the non-soulbound items.
It's good to hear that we might get more space in the future. I'll be able to carry more while farming for primals or anything really. But the real reason why my bags are always full is all the stacks of cloth I carry in my bags and in my bank. I counted something like 40 stacks of netherweave cloth or even more last time I checked. Hehe