Version 4 of iMetaSearch comes in two flavors. The Pro and Free flavors are identical except that the Free flavor can only use the Google engine and is limited to 100 search results. The Pro flavor has 12 engines including Google and has no limit on the number of search results.
Version 4 of iMetaSearch has the following new features that have been added since version 3.
1) Engine categories have been added to help organize engines.
2) Groups (called topics in version 3) have colors, not just numbers, which makes it easier to spot patterns.
3) Result summaries can have images, in version 3 they would just show a placeholder image.
4) Updated all sections of the manual.
5) Better Vista compatibility.
6) Bug fixes.
Everything that is in version 3.04 of iMetaSearch is also in version 4 of iMetaSearch Pro except that the Build Engine command has been removed because no one was using it.