Is the female USB tip just a standard port that I could use to plug in the (long) cables that came with these items?

If your products have a ord with a male USB end on them, they can plug into the female USB charger tip.  You may want to double check that they do not require a special USB charge adapter.  You Nokia 6350 should work with charging tip #54912.  I cannot confirm the correct tip for the Nokia E71x or the Sansa fuse MP3 as I cannot find a pin count.  Please check with the manufacturer on those items.