The service is Search & RSS aggregation across multiple platforms (i.e. google, blogsearch & twitter). Once these are aggregated the tool also allows you to share a link, subscribe via RSS or email and embed a widget on your website.
The problem that it solves is "searching a term or topic across multiple sites is difficult and time consuming, and there's no easy way for me to aggregate and share this"
Your present tools aren't good enough because they don't aggregate search (e.g. google shows 1 list of search results across all sites) and this makes it time consuming to do the kind of web, blog and social search needed today. They also don't allow you to easily subscribe, share and widgetize up-to-date search results.
We're working on the homepage copy to make this clearer to new users, and this might include a demo video.
Any more feedback on this is much appreciated :-)