Network+ is geared more towards doing networks. Keeping them running, hardware, the different layers, cabling, OS's (although I think they lean towards MS on that). Or as CompTIA put it:
Earning the Network+ certification means that the candidate possesses the knowledge needed to configure and install the TCP/IP client. This exam covers a wide range of vendor and product neutral networking technologies that can also serve as a prerequisite for vendor-specific IT certifications.

I-net+ is more for Internet. HTML, ftp, www, irc. Or as CompTIA put it:
I-Net+ is a vendor-neutral, entry-level Internet certification program that tests baseline technical knowledge of Internet, Intranet and Extranet technologies, independent of specific Internet-related career roles. Learning objectives and domains examined include Internet basics, Internet clients, development, networking, security and business concepts.

------------------
.·°Danrak°·.