This utility extracts PubMed ID's (PMID) from a saved HTML or text-only PubMed search result page. The extracted PMID's are reformatted into a form that can be pasted into the "Details" page at PubMed).
Your PubMed file to upload should look something like this example. Note that the complete list should be on one page (controlled by the "Show" selection box; just use "Show 500" to be safe.). Whether the file is HTML or plain text, abstract or brief or summary, etc., is not important, as far as I know. This script is designed to look for text patterns like "PMID: 16684601", but it also works on lists of bare PMID's (e.g., "16684601 16679492 16679490").