I use Picasa because it does many different things very well at a basic level (viewing, sorting, grouping, labeling, searching, editing, importing, exporting, uploading, etc). There could very well be better software out there for exactly what you need, but I do like Picasa and would recommend it if you haven't tried it yet. I also remember using and liking Irfanview back in the day due to it's ease of use.
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