Viewfinder on my D3100 is sorta blurry?

OKAY. I have a Nikon D3100 and it has the live-view feature which i don't use that much.
i bought my camera on March 1st, 2011 so its exactly 2 months old, basically new.
when i go to focus my subject i started to notice it was a little blurry but when i switched to the live-view on the LCD, in was perfectly in focus.

it looks like there's a smudge or something on the INSIDE of my camera. I already cleaned it well, and same thing.

NOTE: my eyes are getting a little worse (i wear glasses), and maybe that's why. But i'm not like getting blind.that's probably half the reason, but even other people using it asked why it was always blurry.
* also, i have never touched the inside of the body, (The mirrors and glass things, because i'm too scared ill mess something up) so it can't be a fingerprint

I want to get a camera tattoo, but I can't decide what kind of camera to get.any ideas?

I own and frequently use my Nikon D3000, but I think tattooing that on my arm might look a little weird… I was looking up camera tattoos and was thinking of getting a more vintage camera. I can't decide. If anyone has any ideas, suggestions, or pictures I'm glad to know them.

Is the Sigma 105mm f/2.8 EX DG Medium Telephoto Macro Len good?

I want a macro lens for insects, flowers, etc. Is this a good choice of lens? I have a Nikon D60 so I know it will not autofocus. I also want to shoot at 1:1

Reviews? Anyone use this lens on a D60 before?

I'm debating which thing i should get?

So my birthday's coming up, and my parents are giving me $250 to spend… I really want the Nikon D3100 (Which is $600 on certain websites) and so i was thinking i could sell some of my stuff, and get it… But i also need clothes because i'm outgrowing most of mine… So should i spend the money on clothes or that camera? (I don't have a camera btw) I could also save money during the summer from my summer job and get the camera that way… But i don't know which do you think would be worth the money? Please don't be mean and call me ungrateful and stuff, i'm grateful for everything i get.

What camera fits my description?

I'm looking for a DSLR camera that has video for around $400, if possible. I was looking at the Nikon d3000, which is $500, but it is out of my price range and does not have video. What camera would you recommend that is in my price range? I'm open to any brands, but I would prefer Nikon or Canon.

Is the Canon EOS 60D better than the Nikon D90?

I want to change my D90 for and EOS 60D

I currently own a Nikon D90 and I want to change it to a Canon EOS 60D, what should I do?

Today I used my cousin's 60D and I found it to be much better, but I'm not completely sure as to what I should do.

I bought a Nikon d3100 but it didn't come with a usb cable?

The box doesn't say it's supposed to be in there and it wasn't in there either but on nikonusa.com it said on the list of accessories, a usb cable is supposed to be in there. And even if it's not supposed to come with it, how am I supposed to put the pictures from the camera on the computer?

Looking for a lens for Nikon d3000?

I'm not sure of the correct terminology, I have a Nikon d3000 which takes awesome photos but I'm looking for a lens that can shot or zoom as far as across a basketball court. Where can I find a reasonable one?

What camera lens should I purchase for shallow depth of field?

I own a Nikon D3100 (18-55 mm lens) and I really want to do more with my camera than what this lens allows. I'm looking for a lens that will give me really shallow depth of field, any suggestions? In addition to purchasing that lens, I'm also looking to purchase a zoom lens. Any suggestions for that, too?
Price is definitely a factor, but I do want good quality, so I'm looking for a good compromise.