you can often get the full text articles if you do the medline search through a university rather than through nlm/nih. i believe universities pay for access to some of them. if you are already doing that, then i don't know what to tell you. i'm not sure they're available without paying in that case.
your uni should have a subscrip. if you can use a proxy through the school, you can get access from home. i use a virtual private network (vpn) to look like i'm coming from a school ip address, and i can access what ever the school has access too. i'm sure your school has this option - call their resnet or whatever.
do you know a prof? Sometimes profs have subscriptions to these journals also.
the above advice is great. (previous reply). A lot of journals have it online and free, especially if the article is not new. So if you find soemthing that 3-4 months old, you can surely find it online.
Also, my state university has a subscription to most of the online medline journals. if you go to your medical library and sit on their computer, you may be able to get it. You see, most state universities have links to these journal articles and the password is saved as cookies. As a result, you probably own't be able to log in from your home, but you may be able to do it from the Univ.
For most of full-length srticle you would need either personal subscription or subscription from a university. My use computers at school to find articles. Soemtime Pubmed puts a direct link on the article so you can just click on it. Or sometime when I am using an off-campus computer, I have to login into their network and search university's library for certain articles. My science profs were amazed by the ammount of information I presented in my paper last year. None had more refrences than I did.