Map Channels state that v3 is a complete re-write that adds support for clustering, spreadsheet feeds, Virtual Earth, and Street View.

Map Channels is a service that allows you to embed custom maps into your website. Based on Google Maps, it is intended as a wrapper to make custom maps easier to implement without any coding.

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Map Channels is a service that lets you embed a custom map into your website or blog without the need for coding.

An extensive range of options let you tailor your map's appearance to your own needs. Options include a place index sidebar and a tools sidebar. Tools available include slide show, map filters, multiple map channels, location links and search channels. Marker tooltips, clickable polygons and lines are standard features.

The service is free. You can use the map scripts generated by this site for both commercial and non-commercial use. 

Further details can be found at:  http://www.mapchannels.com/