Before I REALLY started getting into Castle there were a handful of couples that I used to love but have either fallen from grace or just plain be been replaced by my love for our favorite detective and author.

For me it used to be Sonny and Kate from General Hospital and after they broke-up I was super sad, but now that I think about them compared to Caskett "ehhh, that relationship was doomed" comes to mind.

When I was really into Gossip Girl I was a fan of both Blair and Chuck and Lily and Rufus, but I kind of fell of the GG wagon after season 2

However, there is one couple that will never be replaced in my heart, possibly because I just love the entire family and they remind me of my mom and dad, is Sandy and Kirsten from The OC.  Though I don't feel like there's to much of a conflict with my love for Castle and Beckett because the OC is no longer on and my love for each couple is different.

So what are the relationships that either have become less important or replaced since watching Castle? I guess that's assuming you are a fan of them in a romantic way

Hmmm…..well for me it was Jerry and Alexis from General Hospital. But looking back on their relationship I can see that it was doomed from the start. I also liked Kate and Sonny, but again, they were doomed.  However, my favorite GH couple of all time  will always be Nikolas and Emily! I was soo sad when they killed her and omg, they were the epitome of soul mates. If any couple can be placed in the same category as Castle and Beckett, it would be those two for sure. 

Fun topic….Its been a while since I have had a favorite tv couple that I was totally into.   If I'm honest with myself probably none come close to Castle and Beckett for me.  But if I had to throw one out there it would probably Harm and Mac on JAG. 

Of shows still on the air, I'd have to say Chuck and Sarah, from Chuck. And funnily enough, they're the best proof around that you can put your main characters into a relationship and it will actually make the show better, if done right.

I like Raylan and Winona on Justified, though they're a bit more complicated, in that they were married, then divorced, then she married someone else. And now she's cheated on her husband with her ex-husband.

Of all time? Hmmm. I tend to like ones that never quite materialize, for one reason or another. Carter and Anna on E.R, Sam and Ainsley on The West Wing. I wouldn't say I 'shipped those couples, but it was more a case of, 'wouldn't it be nice if…' Unfortunately Maria Bello's movie career and Emily Procter getting a central gig on CSI threw spanners into the works.

Besides Castle and Beckett, I am really enjoying the relationship between Dr. Lightman and Dr. Foster on Lie to Me. 

However, Mulder and Scully, along with Piper and Leo, would have to be my first favorite TV couples (and they still are some of my favorites). Along with them, I also enjoyed Sawyer/Juliet, Charlie/Claire, Hurley/Libby, Jin/Sun and Desmond/Penny from Lost. From ER, I liked Pratt and Chen together, because I just thought they looked cute together and they seemed to fit each other. 

That's pretty much it for me. 

I used to love the oc my fave couple was sandy and Kirsten, because everyone else were teenagers (I was just outta high school when the show started) other couples um mac and Felicia from general hospital (late 90s) Bobby and Lindsay? (kelli willams from lie to me, I think lindsay was her characters name) Mateo and Hailey (all my children, they were popular in the mid 90s) that's all I can think of

I'm a crazy shipper! I just cannot not have a couple to ship for.

Most of the couples I love were already cited here, however, I do like some unorthodox couples.

I think that the very first couple I rooted for was Jesse and Becky in Full House… followed by Piper and Leo (Charmed), who were the first ones to et me to foruns, artwork and shipper madness =) 

I was a strong Carby fan, but once that was over, I really fell for Dr. Susan and Chuck relationship (drunk marriage in Vegas, divorce, pregnancy…) they were fun together and she was my favorite character in the show (ER).

I was crazy about Dr. Cox and Jordan in Scrubs, never really cared about JD and Elliot, but those two were hilarious, and everything he or she would warm up to each other I'd just melt…

I did enjoy Bones/Both relationship once, nut I can't barely remember why =P And now I'm a completely devoted Caskett fan (best will-they-wont-they in TV) and a newly converted Chuck/Sarah fan (just catch up with the series now) and I have to agree with Yossarian, it's the best example that TV couples CAN work and usually do best when they are together. I now there are a lot of long term chuck fans who are dissatisfied with their relationship, but I find it really rewarding to watch as it was during the whole development. 

I'd be extremely satisfied if Castle writers would follow their example, and with their amazing writing (which tops Chuck by far) I can't imagine myself not being in love with Castle and Beckett forever =P