Dennou Coil, Moyashimon Recommendations
Something about the presentation of Dennou Coil reminds me of Moyashimon. The soundtrack is very similar in both shows, and both have a similar art style (even though Dennou Coil seems to have better animation).
They also both deal with little cute-looking creatures who run around the world. However, in Moyashimon, only the main character can see these creatures, while in Dennou Coil, it's anybody wearing the glasses.
Dennou Coil is also more focused on cyberspace, while Moyashimon is focused on things happening in the real world, but both shows have their fair share of lighthearted adventure.