Programmatically determine if a web-scoped feature has been activated

This may be of limited use, but if you're ever looking for a way to programmatically determine if a web-scoped feature has been activated on a given SharePoint site, here is a quick method you can use to obtain that information:

private bool IsFeatureActivated(Guid siteId, Guid webId, Guid featureId)
{
    bool isFeatureActivated = false;
    using (SPSite site = new SPSite(siteId))
    {
        using (SPWeb web = site.OpenWeb(webId))
        {
            if (web.Features[featureId] != null)
            {
                isFeatureActivated = true;
            }
        }
    }
    return isFeatureActivated;
}