When you leveled up, you chose to increase your stamina. Increasing your base stamina also increases the amount you can carry. However, items which boost stamina do not. You'll need to learn the Fortify Carry enchantment for that.Im not sure what I did, but my 300 carry weight is now 305 (or 310), while its not a huge difference, it often allows me to carry that one extra item that I dont want to leave behind. I cant wait to purchase a house so I can have a place to put things that I want to keep, but dont want to carry all of the time.
As I've said to others, Breezehome in Whiterun is the cheapest house in the game, costing only 5000 gold. After you get done with the Thieves Guild and do some a few extra quests for them, you should be able to make that money up fairly quickly.
Before I started playing, I heard a podcast saying that if you set your autosave for every fifteen minutes, and turn autosave during travel off, it will help eliminate freezing and some glitches because its not constantly saving. This is what I have done, and while Im still only scratching the service of the game, I havent experienced any issues with it yet.
Yeah, there are a lot of tips like that, but my save file is nearly 12 MB, so there's only so much that can be done. I have Autosave on Start menu at 30 minutes, and I've turned off all other Autosaves. It's not BAD anymore, but still get the occasional freeze.