My 8mth old gets whiny and clingy and well, annoying (if we're being honest here) for about a week or before a tooth arrives.
She also does seem to get very, very frustrated with her body and not being able to do certain things. She drags her little self around the floor, exhausting herself and pulling herself up on things and getting annoyed that she can't go anywhere.
I try, but it's hard, to realise that they must find being a baby quite difficult sometimes. And sometimes I just feel wrecked and wish she'd pipe down.
Her new thing is screeching. Screeching, screeching, screeching all day. Nnngggh. I think it's frustration at not being able to communicate. She responds very well at our baby signing classes though and I'm hoping we can keep it up at home and help her.
If your baby calms down looking out the window or going out, then she's is very likely to be bored.
Try putting some of her toys away so she "forgets" them and rotate with other toys so she can rediscover them.
Bring out the wooden spoons, plastic spatulas, any little plastic pots from the kitchen or any household item which is safe. My baby seems to get far more out of exploring adult things than toys and you can see a difference in her when I produce either a new toy, or one she hasn't seen in a few weeks.
HTH.