Digital comics are gaining momentum as more people enjoy the convenience of downloading comics onto their tablet device and/or phone, and/or read them on their browser while they’re already at their computer. July has already seen a lot of announcements and Comic-Con, as expected, had a ton more. Here are the highlights:

• Digital comics sales have doubled for the first six months of 2011, according to industry white papers presented by ICv2 Publisher and CEO Milton Griepp. Digital sales were estimated at less than one million in 2009, somewhere between $6 and $8 million in 2010, and will likely double that amount by the end of 2011. Despite fears of losing print readers to digital, the report states there’s little evidence to suggest a significant level of overlap between buyers in the two markets. Much of the growth is led by the strength of the iPad, with a lot of potential still expected from the Android and e-readers like the Kindle and Nook. Digital sales on PSP have mostly collapsed, likely due to a massive hacking incident on the Sony PlayStation network in April that resulted in the service being shut down for nearly a month and the compromise of millions of their users’ personal data. New additions to the PSP Digital Comics Store were discontinued earlier this month, although the program may get relaunched when Sony releases the PlayStation Vita, expected toward the end of the year. (ICv2)
• Marvel Comics will begin transitioning to simultaneous print and digital releases (instead of waiting months to release the digital versions of their print comics) starting with this week’s Amazing Spider-Man #666, which kicks off the “Spider-Island” summer event, and the current X-Men event Schism. The Spider-Man family of titles will be released the same day and date in comic book stores and through web and mobile devices. Uncanny X-Men #1 and Wolverine & the X-Men #1 will follow in October and November. Marvel, the comics industry’s number one publisher, will look for more opportunities as titles hit good jumping-on points. (ICv2)
• VizManga.com has launched from the largest US publisher of Manga, Viz Media. The site syncs with their iOS and Android apps, so manga bought at one can be read on the others. There is a 40% sale going until July 31 and the first chapter of each manga is available for free. There are currently over 40 series and over 300 volumes available, with more added each week. (Robot 6)
• A collection of 39 Japanese publishers will launch JManga, a web portal to read manga online and interact with creators and fans, in August. Popular manga like One Piece and Naruto are expected to be part of the line-up, as well as more obscure titles that have never been licensed for US release. The cooperative initiative is intended to reverse shrinking sales that publishers feel are due to importing lag time, piracy, and the closing of Borders. (Anime News Network)
• Top Shelf entered the digital space by launching over 70 graphic novels on the Comics+ app by iVerse Media. According to this interview with Robot 6, they want to have everything in their library that they can release digitally to be available by the end of the summer. They will also be launching on other digital distributors soon and will have their own apps, one for Top Shelf’s entire line and a Kids Club app for their all-ages material. They also have some books on the Kindle, Nook, iBooks, and Google eBookstore. (Top Shelf)
• Panelfly will be relaunching their app as Panelfly Prime and Panelfly Plus beginning in early August. The two apps will enhance the now-standard comics reader experience with videos, news and social media integration within the comic, an experience they’re pitching as SuperMedia. Their recently released Burn Notice digital comic is a template for what they’re building. (Comic Book Resources)
• Graphicly is adding bonus features and other enhancements to digital comics. Similar to DVD bonus features, the first batch includes audio commentary tracks by creators and trailers, with more to come. (The Couch)
• LucasFilm OK’ed the digital release of Star Wars comics, so the Dark Horse Digital Store now has tons of Star Wars comics, with more to be added every week. Dark Horse Comics has been publishing Star Wars comics for 20 years now. Part of the release includes Marvel Comics’ 1977 adaptation of the original movie Stars Wars Episode IV: A New Hope. (Dark Horse)
• Manga publisher Square Enix is running a special sale on their online reader site. If you “like” their Facebook page or got a special URL at Comic-Con, you can get the first volume of any of their 15 series (including Fullmetal Alchemist) for free. Books are usually priced at $5.99. The deal is good until August 10. (Robot 6)